Thursday, 2 April 2026

 

Page 5 – Reasoning (Blood Relation)

Problem • Step-wise Solution • Diagram Method


Family tree diagram concept

Q1. A is father of B, B is sister of C. What is A to C?

Step 1: Identify relations

A → father of B

B → sister of C

Step 2: Understand sibling relation

B and C have same parents

Step 3: Connect A to C

A is also father of C

Answer: Father

Trick: Same siblings → same parents


Q2. A is mother of B, B is brother of C. What is A to C?

Step 1: A → mother of B

Step 2: B and C are siblings

Step 3: A is parent of both

Answer: Mother

Trick: Brother/sister → same parent


Q3. A is son of B, B is daughter of C. What is A to C?

Step 1: A → child of B

Step 2: B → child of C

Step 3: A is child of C's child

Answer: Grandson

Trick: Two generations → grand relation


Q4. A is brother of B, B is mother of C. What is A to C?

Step 1: A and B are siblings

Step 2: B is parent of C

Step 3: A is sibling of parent

Answer: Uncle

Trick: Parent's brother = uncle


Q5. A is sister of B, B is father of C. What is A to C?

Step 1: A and B are siblings

Step 2: B is parent of C

Step 3: A is sibling of parent

Answer: Aunt

Trick: Parent's sister = aunt


Diagram Method

Always draw simple tree:
Parent → Children
Sibling → Same level
Grand → One level above


Key Words

  • Father/Mother → Parent
  • Brother/Sister → Same level
  • Son/Daughter → Below level
  • Grandfather → Two levels above

Shortcut Tip

Always draw diagram → never solve mentally


Final Tip

Identify generation first → relation becomes easy


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