NDA NA 2026 — General Intelligence & Reasoning: Blood Relations Concept Guide + 10 MCQs
Master Blood Relations for NDA NA 2026. This guide covers theory, shortcuts, and 10 practice MCQs.
Concept: Blood Relations
Blood Relations trace family connections. Key rule: draw a family tree. Use ♂/♀ to mark gender clearly.
Key Terms
- Uncle/Aunt = parent's sibling
- Nephew/Niece = sibling's child
- Cousin = uncle/aunt's child
- In-law = spouse's relative
⚡ Shortcuts & Tricks
- Always draw the family tree
- Mark gender with symbols
- 'Only son/daughter' clues are critical
- Decode coded relations step by step
Practice MCQs (10 Questions)
Q1. A is the mother of B. C is the brother of A. What is C to B?
- A. Uncle
- B. Nephew
- C. Cousin
- D. Father
Answer: A — C is A's brother. A is B's mother. So C is B's maternal uncle.
Q2. Pointing to a woman, Ravi says 'She is the only daughter of my grandfather's son.' How is she related?
- A. Sister
- B. Mother
- C. Aunt
- D. Niece
Answer: A — Grandfather's son = father. Father's only daughter = sister.
Q3. A woman introduces a man as son of her mother's brother. How is the man related?
- A. Cousin
- B. Nephew
- C. Uncle
- D. Son
Answer: A — Mother's brother = uncle. Uncle's son = cousin.
Q4. Rohit's mother is the only daughter of Seema's father. How is Seema related to Rohit?
- A. Mother
- B. Sister
- C. Aunt
- D. Grandmother
Answer: A — Only daughter of Seema's father = Seema. So Seema is Rohit's mother.
Q5. Pointing at a man, a lady says 'His mother is the only daughter of my mother.' Relation of lady to man?
- A. Mother
- B. Sister
- C. Grandmother
- D. Aunt
Answer: A — Only daughter of lady's mother = lady herself. So the man's mother = the lady.
Q6. P is brother of Q. R is mother of Q. S is father of R. How is P related to S?
- A. Grandson
- B. Nephew
- C. Son
- D. Grandfather
Answer: A — R is P and Q's mother. S is R's father. So S is P's grandfather and P is S's grandson.
Q7. A + B = A is father of B. A - B = A is mother of B. P + Q - R means P is R's ___?
- A. Grandfather
- B. Grandmother
- C. Father
- D. Uncle
Answer: A — P is Q's father. Q is R's mother. So P is R's maternal grandfather.
Q8. X says to Y: 'Your mother's husband's sister is my aunt.' How is Y related to X?
- A. Sibling
- B. Nephew/Niece
- C. Cousin
- D. Parent
Answer: A — Y's mother's husband = Y's father. Father's sister = aunt. Same aunt as X's → Y and X are siblings.
Q9. Introducing Rita, Sonu says 'She is the wife of my wife's only brother.' Rita is Sonu's ___?
- A. Sister-in-law
- B. Wife
- C. Niece
- D. Cousin
Answer: A — Wife's brother = brother-in-law. His wife = Sonu's sister-in-law.
Q10. A is B's sister. C is B's mother. D is C's father. How is A related to D?
- A. Granddaughter
- B. Daughter
- C. Grandmother
- D. Great Granddaughter
Answer: A — A is C's daughter. D is C's father. So A is D's granddaughter.
Summary
Draw a family tree for blood relation problems. Never solve complex ones mentally.
