Blood Relations Problems FOR Placement

Introduction

Blood relations is one of the most frequently asked topics in campus placement exams conducted by leading IT companies like TCS, Infosys, Wipro, Accenture, Cognizant, and others. This topic tests your ability to understand and analyze family relationships, decode complex relationship chains, and determine connections between family members.

The importance of blood relations questions in placement exams cannot be overstated. These questions assess your logical reasoning capabilities, analytical thinking, and ability to process information systematically. In real-world scenarios, software professionals often need to understand complex hierarchies and relationships in data structures, making this skill highly relevant.

Blood relations questions typically appear in the logical reasoning section and carry significant weightage. With proper understanding of family relationship terms and systematic problem-solving approaches, you can solve these questions accurately and quickly, giving you an edge over other candidates.

This comprehensive guide covers 20 carefully selected blood relations problems with detailed solutions, along with proven shortcuts, family tree techniques, and common mistakes to avoid. Master these concepts to excel in your placement exams.

20 Practice Questions with Detailed Solutions

Question 1: Basic Relationship

Pointing to a photograph, Rahul said, "She is the daughter of my grandfather's only son." How is the girl in the photograph related to Rahul?

Options: a) Sister b) Cousin c) Niece d) Daughter e) Cannot be determined

Solution: Rahul's grandfather's only son would be Rahul's father (or uncle if father has brothers, but "only son" means just one). So the girl is the daughter of Rahul's father, making her Rahul's sister. Answer: a) Sister

Question 2: Complex Chain

A is B's sister. C is B's mother. D is C's father. E is D's mother. How is A related to D?

Options: a) Grandmother b) Granddaughter c) Daughter d) Grandfather e) Niece

Solution: C is B's mother, so C is also A's mother (since A is B's sister). D is C's father, making D the grandfather of A and B. Therefore, A is D's granddaughter. Answer: b) Granddaughter

Question 3: Coded Relations

If P + Q means P is the brother of Q, P - Q means P is the sister of Q, and P × Q means P is the father of Q, which of the following means A is the uncle of B?

Options: a) A + C × B b) A × C + B c) A - C + B d) A + C + B e) None of these

Solution: For A to be B's uncle, A must be the brother of B's parent. Option (a) A + C × B means A is brother of C, and C is father of B. So A is B's paternal uncle. Answer: a) A + C × B

Question 4: Family Tree

In a family, there are six members A, B, C, D, E, and F. A and B are a married couple. D is the only son of C, who is the brother of A. E is the sister of D. B is the daughter-in-law of F, whose husband has died. How is F related to A?

Options: a) Mother b) Sister c) Aunt d) Mother-in-law e) Cannot be determined

Solution: A and B are married. C is A's brother. D is C's son, making D A's nephew. F is B's mother-in-law (since B is F's daughter-in-law), and since A is married to B, F is A's mother. Answer: a) Mother

Question 5: Gender Determination

Pointing to a man, Suresh said, "His only brother is the father of my daughter's father." How is the man related to Suresh?

Options: a) Uncle b) Father c) Grandfather d) Brother e) Cannot be determined

Solution: Suresh's daughter's father is Suresh himself. So the man's brother is Suresh's father. Therefore, the man is Suresh's uncle (father's brother). Answer: a) Uncle

Question 6: Multi-Generation

Introducing a woman, Ravi said, "She is the wife of my father's only grandson." How is the woman related to Ravi?

Options: a) Daughter b) Daughter-in-law c) Niece d) Sister-in-law e) Cannot be determined

Solution: Ravi's father's only grandson would be Ravi's son (assuming Ravi has a son). The woman is the wife of Ravi's son, making her Ravi's daughter-in-law. Answer: b) Daughter-in-law

Question 7: Direction-Based Relations

A woman walking with a boy meets another woman and says, "He is the son of my wife's only daughter's husband." How is the boy related to the first woman?

Options: a) Son b) Grandson c) Nephew d) Cannot be determined e) None of these

Solution: The woman's wife's only daughter's husband would be her son-in-law. The boy is the son of her son-in-law, making him her grandson. Answer: b) Grandson

Question 8: Sibling Relations

M is the brother of N. N is the sister of O. O is the father of P. How is P related to M?

Options: a) Nephew or Niece b) Son c) Daughter d) Brother e) Cannot be determined

Solution: M and N are siblings. N is O's sister, making M also O's brother. O is P's father, so P is M's nephew or niece (depending on P's gender). Answer: a) Nephew or Niece

Question 9: Coded Symbols

If A $ B means A is the father of B, A # B means A is the sister of B, and A @ B means A is the brother of B, which of the following indicates that P is the grandfather of Q?

Options: a) P $ R $ Q b) P # R @ Q c) P $ R @ Q d) P @ R $ Q e) None of these

Solution: For P to be Q's grandfather, P must be the father of Q's parent. Option (c) P $ R @ Q means P is father of R, and R is brother of Q. So P is father of both R and Q, making P Q's father, not grandfather. Option (a) P $ R $ Q means P is father of R, and R is father of Q, making P Q's grandfather. Answer: a) P $ R $ Q

Question 10: Complex Family

In a family of seven people A, B, C, D, E, F, and G: A is the father of B. C is the mother of D. E is the brother of F. G is the daughter of B. D is the sister of G. How is C related to A?

Options: a) Wife b) Sister c) Daughter d) Cannot be determined e) None of these

Solution: G is daughter of B. D is sister of G, so D is also daughter of B. C is mother of D, so C is B's wife (and mother of G and D). Since A is father of B, and C is B's wife, C is A's daughter-in-law, not among the options. However, if the question asks about another relationship, we need to re-analyze. Actually, if B and the sibling's parent is A, and C is D's mother where D is G's sister and G is B's daughter, then C is B's wife, making C A's daughter-in-law. Since this isn't an option, the answer is (d). Answer: d) Cannot be determined

Question 11: Photograph Problem

Pointing to a photograph, a man said, "I have no brother or sister, but that man's father is my father's son." Whose photograph was it?

Options: a) His own b) His son's c) His father's d) His nephew's e) Cannot be determined

Solution: Since the man has no brother, "my father's son" refers to himself. So "that man's father" is himself, meaning the photograph is of his son. Answer: b) His son's

Question 12: Marriage Relations

A is B's wife's sister's husband's mother. How is A related to B?

Options: a) Mother b) Mother-in-law c) Sister d) Aunt e) Cannot be determined

Solution: B's wife's sister's husband is B's brother-in-law (co-brother). A is that person's mother, making A B's mother-in-law (since B's wife and her sister share the same mother). Answer: b) Mother-in-law

Question 13: Generation Gap

P is the son of Q. R is the father of S. T is the daughter of P. U is the brother of S. V is the mother of Q. How is T related to V?

Options: a) Granddaughter b) Great-granddaughter c) Daughter d) Niece e) Cannot be determined

Solution: V is mother of Q. Q is parent of P. P is parent of T. So T is V's great-granddaughter. Answer: b) Great-granddaughter

Question 14: Symbol Decoding

If X * Y means X is the mother of Y, X / Y means X is the father of Y, X + Y means X is the sister of Y, and X - Y means X is the brother of Y, then which expression means P is the aunt of Q?

Options: a) P + R / Q b) P * R + Q c) P - R + Q d) P + R - Q e) None of these

Solution: For P to be Q's aunt, P must be the sister of Q's parent. Option (a) P + R / Q means P is sister of R, and R is father of Q. So P is Q's paternal aunt. Answer: a) P + R / Q

Question 15: Family Hierarchy

In a family, A is the father of B. C is the daughter of B. D is the brother of E. E is the daughter of C. F is the mother of A. How is D related to F?

Options: a) Great-grandson b) Grandson c) Son d) Nephew e) Cannot be determined

Solution: F is mother of A. A is father of B. B is parent of C. C is parent of E and D. So D is F's great-grandson. Answer: a) Great-grandson

Question 16: Multiple Relationships

Pointing to a woman, Rajesh said, "She is the only daughter of my mother-in-law's only son." How is the woman related to Rajesh?

Options: a) Wife b) Sister c) Sister-in-law d) Daughter e) Cannot be determined

Solution: Rajesh's mother-in-law's only son would be Rajesh's wife's brother (brother-in-law) OR if the mother-in-law has only one child who is Rajesh's wife, then "only son" doesn't exist. Assuming the mother-in-law has a son, that son is Rajesh's brother-in-law. His only daughter would be Rajesh's niece. However, if "only son" refers to Rajesh himself (if the mother-in-law considers him as son), then the woman is his daughter. Given typical phrasing, the answer is likely (d) Daughter if we interpret that Rajesh is the only son being referred to as the son-in-law in a broader sense, or the question might have a different interpretation. Answer: d) Daughter

Question 17: Cousin Relations

A is the brother of B. C is the father of A. D is the sister of E. E is the daughter of B. How is D related to C?

Options: a) Granddaughter b) Daughter c) Niece d) Cannot be determined e) None of these

Solution: C is father of A and B. B is parent of E. E is sister of D. So D is also B's child, making D C's grandchild (granddaughter). Answer: a) Granddaughter

Question 18: Complex Chain

P is the mother of Q. R is the brother of S. S is the daughter of T. T is the husband of P. U is the father of T. How is R related to U?

Options: a) Grandson b) Son c) Nephew d) Cannot be determined e) None of these

Solution: P and T are married. S is their daughter. R is S's brother, so R is also P and T's son. U is T's father, making U R's grandfather. So R is U's grandson. Answer: a) Grandson

Question 19: Marriage Chain

A is B's sister. C is B's mother. D is C's mother. E is D's husband. F is E's father. How is A related to F?

Options: a) Great-granddaughter b) Granddaughter c) Daughter d) Niece e) Cannot be determined

Solution: E is D's husband and C's father. C is B and A's mother. F is E's father, making F A's great-grandfather. Therefore, A is F's great-granddaughter. Answer: a) Great-granddaughter

Question 20: Gender Puzzle

Pointing to a person, Arun said, "He is the only son of the person who is the mother of my mother's only daughter." How is the person related to Arun?

Options: a) Father b) Brother c) Uncle d) Cannot be determined e) None of these

Solution: Arun's mother's only daughter could be Arun himself (if male) or his sister. Assuming Arun is male, "my mother's only daughter" refers to Arun's sister or could be interpreted differently. The mother of Arun's mother's only daughter is Arun's mother. Her only son is Arun himself or his brother. This question seems to point to the person being Arun's brother or father depending on interpretation. Given typical structure, the answer is likely (b) Brother or (a) Father. Re-analyzing: If Arun's mother has only one daughter, and that daughter's mother is Arun's mother, then her only son would be Arun or his brother. If the person is different from Arun, it's his brother. Answer: b) Brother

Tips & Tricks for Blood Relations

Draw Family Trees: Always sketch a quick family tree diagram. Use symbols (circles for females, squares for males) to track relationships visually. This eliminates confusion.
Identify the Gender: Pay close attention to gender-specific terms like "son," "daughter," "brother," "sister," "father," and "mother." Don't assume gender when not specified.
Work Backwards: Start from the person whose relationship you need to find and work backwards through the chain of relationships.
Use Standard Notations: Develop your own shorthand for quick diagrams: M for male, F for female, horizontal lines for marriage, vertical lines for parent-child relationships.
Break Down Complex Statements: Divide long relationship chains into smaller parts. Solve each part step by step instead of trying to understand everything at once.
Watch for "Only" and "Only Child": These terms are crucial. "Only son" means there are no other sons, but there could be daughters.
Practice Coded Relations: For symbol-based questions, write down what each symbol means clearly before attempting to solve. Create a legend for reference.

Common Mistakes to Avoid

Assuming Gender: Never assume someone's gender unless explicitly stated. Terms like "child," "sibling," or "parent" don't specify gender.
Confusing Generations: Keep track of which generation each person belongs to. It's easy to mix up grandparents with parents or grandchildren with children.
Ignoring "In-Law" Relationships: Be careful to distinguish between blood relations and relations by marriage (in-laws, step-relations).
Misinterpreting "Only": "Only son" means the only male child, but the person could have sisters. Don't confuse this with "only child."
Overlooking Self-Reference: In photograph questions, the speaker might be referring to themselves indirectly. Look for phrases like "my father's son" when the speaker has no brothers.
Mix Up of Maternal and Paternal: Clearly distinguish between mother's side and father's side of the family, especially for uncle/aunt and cousin relationships.
Not Verifying All Options: In coded relation questions, verify each option thoroughly. Don't stop at the first seemingly correct answer.

Conclusion

Blood relations questions are scoring opportunities in placement exams if approached systematically. The key to mastering this topic lies in understanding family relationship terminology, practicing regular diagramming techniques, and developing the ability to decode complex relationship chains.

Remember that these questions test your logical thinking and systematic approach more than your knowledge of family structures. By drawing clear family trees, paying attention to gender indicators, and breaking down complex statements into manageable parts, you can solve even the most challenging blood relations problems accurately.

Practice is essential – the more questions you solve, the faster you'll recognize patterns and relationships. Focus on accuracy first, then work on improving your speed. With consistent practice using the 20 questions provided in this guide and applying the tips shared, you'll be well-prepared to tackle blood relations questions in your placement exams confidently.

Good luck with your preparation!