RRB PO Mains Blood Relations Questions, Know Full Concept with Example

Blood Relation questions are an important part of the Reasoning Ability section in the RRB PO Mains exams. These questions are asked every year in the exam in multiple formats, like puzzles or coded blood relations. These questions test your ability to interpret and analyse family relationships based on given statements. Mastering blood relation questions requires daily practice with a strong hold on the basic concepts. This blog covers the concept explanation of solving these types of questions, along with examples and tips to solve them quickly in the RRB PO exam.

What is the Blood Relation Concept?

These questions involve identifying the relationship between two individuals based on a series of statements. The relationships may be direct (mother, brother) or indirect (aunt’s son, paternal grandfather).

Basic Family Relationship Terms used in Blood Relation Questions:

Term	Relation
Father’s/Mother’s Father	Grandfather
Father’s/Mother’s Mother	Grandmother
Brother’s Son/Daughter	Nephew/Niece
Sister’s Husband	Brother-in-law
Husband’s/Wife’s Sister	Sister-in-law

Types of Blood Relation Questions Asked in RRB PO Exam

The different types of blood relation questions that usually come in the RRB PO exam are direct blood relation, indirect blood relation, coded blood relation, and puzzle-based blood relation.

Direct Blood Relations

These are straight-forward relationships:

• Father, Mother, Brother, Sister
• Son, Daughter, Husband, Wife
• Uncle, Aunt, Nephew, Niece
• Grandfather, Grandmother, etc.

Example:
“A is the mother of B.” → Direct relation.

Indirect/Nested Relations

These require logical linking of multiple relations:

• Use substitution and step-wise analysis.

Example:
“A is the brother of B. B is the mother of C. How is A related to C?”

• A is the maternal uncle of C.

Coded Blood Relations

In these questions, symbols represent family relations.

Common symbols used:

Symbol	Meaning
A + B	A is the father of B
A – B	A is the mother of B
A * B	A is the sister of B
A / B	A is the brother of B

Example:
If A + B – C, what is A’s relation to C?

• A is the father of B, B is the mother of C → A is maternal grandfather of C.

Puzzle-based Blood Relations

These involve 3–4 statements and require drawing a family tree to decode.

These involve multiple family members and layered statements. Drawing a family tree is the best approach.

Example:
“There are 6 members in a family: A, B, C, D, E, and F. A is the father of B. D is the sister of E. F is the mother of D. C is the son of A. E is the son of F.”

Solve step-by-step and create a family tree.

What is a Family Tree?

A family tree is a diagram that shows the relationship between different members of a family.

The family tree helps in solving the questions related to the blood relation.

The following points help in drawing a family tree.

1. All the female members of the family are represented with a ‘–’ sign with their name.

2. All the male members of the family are represented a ‘+’ sign with their name.

3. The relation between two members of the family is shown by connecting a line.

5. All the family members of the same generation are represented together. Ex: brothers, Sisters, cousins, wife, husband, etc.

6. All the family members of the next generation are represented below in the family tree. Ex: grandparents are represented above the parents, who are represented above their child and so on.

Observation:

• A is husband of B.
• D is the daughter of A.
• C is the brother of D
• G is wife of E.
• C is the brother-in-law of E.
• D is sister-in-law of J.
• E is father of H.
• D is mother of H.
• H is grandson of F.
• I is granddaughter of F.
• F is paternal grandfather of H
• G is paternal grandmother of H.
• A is maternal grandfather of H.
• B is maternal grandmother of H.

Below is a family tree table based on the above diagram that you can refer to:

Person	Relation	Related To	Additional Info
A	Husband	B	A is male
B	Wife	A	B is female
D	Daughter	A & B	D is female
C	Brother	D	C is male
C	Brother-in-law	E	C’s sister (D) is E’s wife
G	Wife	E	G is female
D	Sister-in-law	J	D is married to J’s brother
E	Father	H	E is male
D	Mother	H	D is female
H	Grandson	F	H is male
I	Granddaughter	F	I is female
F	Paternal Grandfather	H	F is E’s father
G	Paternal Grandmother	H	G is E’s wife
A	Maternal Grandfather	H	A is D’s father
B	Maternal Grandmother	H	B is D’s mother

Example of Coded and Direct Blood Relation Questions With Solution

Below, we have provided an example of coded blood relation and direct blood relation questions with an explanation.

Example 1: (Direct)

Q: Pointing to a woman, Ravi said, “She is the daughter of the only son of my father.”
A: The woman is Ravi’s daughter.

Explanation:

• “Only son of my father” → Ravi himself
• “She is the daughter of Ravi” → So she is Ravi’s daughter.

Example 2: (Coded)

Q: If A + B means A is the father of B, A – B means A is the sister of B, A * B means A is the mother of B, and A ÷ B means A is the brother of B, then what does P * Q + R mean?

A: P is the mother of Q, Q is the father of R → So, P is the grandmother of R

Tips to Speed up Solving Blood Relation Questions

Follow the tips provided below to solve the blood relation questions quickly:

Tip 1: Step-by-step analysis – Don’t jump to conclusions.
Tip 2: Draw diagrams/family trees – Especially helpful in puzzles.
Tip 3: Identify gender from clues.
Tip 4: Practice coded patterns for speed.

Disclaimer: This blog provides practice blood relation questions for RRB PO preparation. Content is illustrative, not official. Candidates must consult RRB PO exam notices for authentic details. Use these examples to strengthen reasoning skills, not as guaranteed exam material.

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