Logical Reasoning · Codes, Relations & Directions
Blood Relations — Questions & Answers
Blood relations questions describe a family link — in words, as a list of relations, or in a symbol code — and ask how two people are related. Draw a small family tree as you read.
- 5 solved questions
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How to approach
Start from the speaker and work outwards one link at a time ('my mother' → 'her only son' → …). 'The only son of my mother', said by a man with no brother, is the speaker himself.
Draw a small family tree: parents above, children below, spouses side by side. Mark each person's gender only when a word like brother, mother or wife tells you.
Translate each option into plain relations from left to right, then check it gives the asked relation exactly, including the person's gender and which side of the family.
Decode the expression symbol by symbol into plain relations, then combine them into one relation between the two people asked about.
5 solved Blood Relations questions
Pointing to a photograph of a man, Arun said, "He is the son of the only son of my father." How is Arun related to that person?
Solution — answer C
The only son of Arun's father is Arun himself, so the man in the photo is Arun's son. Arun is his father.
4 steps · reveal one at a timeStep 1: Identify the speaker
Arun is speaking about a man in a photograph. The crucial part of his statement is "my father." This refers directly to Arun's own father.
Step 2: Interpret "only son"
Arun says, "the only son of my father." Since Arun is referring to his own father, the only son of Arun's father must be Arun himself. There can be no other person.
Step 3: Determine the relationship
Arun states, "He is the son of the only son of my father." We've established that "the only son of my father" is Arun. Therefore, the man in the photograph is the son of Arun.
Step 4: The answer
So the answer is (C) Father. If the man in the photograph is Arun's son, then Arun is the man's father.
Ramesh is the brother of Uma. Uma is the mother of Bala. How is Ramesh related to Bala?
Solution — answer D
Ramesh is the brother of Bala's mother, so he is Bala's maternal uncle.
4 steps · reveal one at a timeStep 1: Identify First Relation
We are told that Ramesh is the brother of Uma. This establishes a sibling relationship between Ramesh and Uma.
Step 2: Identify Second Relation
Next, we learn that Uma is the mother of Bala. This means Uma is Bala's direct parent.
Step 3: Connect the Relations
Since Uma is Bala's mother, and Ramesh is Uma's brother, Ramesh is the brother of Bala's mother.
Step 4: The answer
So the answer is (D) Maternal uncle. Ramesh is the brother of Bala's mother, which makes him Bala's maternal uncle.
If 'x + y' means x is the mother of y; 'x − y' means x is the brother of y; 'x × y' means x is the sister of y; 'x ÷ y' means x is the father of y. Which expression shows that P is the maternal uncle of Q?
Solution — answer B
'P − M + Q': P is the brother of M, and M is the mother of Q, so P is Q's maternal uncle. '÷' would make him the paternal uncle, and '×' makes P a sister.
4 steps · reveal one at a timeStep 1: Define the Goal
We need to find an expression where P is the maternal uncle of Q. This means P must be the brother of Q's mother. Let's keep this target relationship in mind as we look at the symbols.
Step 2: Decode Symbols
Let's list what each symbol means: 'x + y' means x is the mother of y; 'x \u2212 y' means x is the brother of y; 'x \u00d7 y' means x is the sister of y; 'x \u00f7 y' means x is the father of y.
Step 3: Construct the Path
To be Q's maternal uncle, P must be the brother of Q's mother. So, we need an intermediate person, say M, such that M is the mother of Q, and P is the brother of M. This translates to 'P2˘212M' (P is brother of M) and 'M+Q' (M is mother of Q).
Step 4: The answer
So the answer is (B) P \u2212 M + Q. This expression correctly shows that P is the brother of M, and M is the mother of Q, making P the maternal uncle of Q.
If 'x + y' means x is the mother of y; 'x − y' means x is the brother of y; 'x × y' means x is the sister of y; 'x ÷ y' means x is the father of y. In 'D + E − F', how is D related to F?
Solution — answer D
D is the mother of E, and E is the brother of F, so D is F's mother too.
5 steps · reveal one at a timeStep 1: Understand the symbols
First, let's understand what each symbol means. 'x+y' means x is the mother of y. 'x−y' means x is the brother of y. 'x×y' means x is the sister of y. 'x÷y' means x is the father of y.
Step 2: Analyze 'D + E'
Now, let's break down the expression 'D + E - F'. The first part is 'D + E'. According to our rules, 'x+y' means x is the mother of y. So, D is the mother of E.
Step 3: Analyze 'E - F'
Next, we look at the second part, 'E - F'. The rule for 'x−y' is that x is the brother of y. This means E is the brother of F.
Step 4: Combine the relationships
We know D is the mother of E, and E is the brother of F. If E is F's brother, they share the same parents. Therefore, if D is the mother of E, D must also be the mother of F.
Step 5: The answer
So the answer is (D) Mother. D is the mother of E, and since E is the brother of F, D is also the mother of F.
Pointing to a photograph of a man, Kavitha said, "He is the only brother of the only daughter of my mother." How is the person in the photograph related to Kavitha?
Solution — answer A
The only daughter of Kavitha's mother is Kavitha herself, so the man is her only brother.
4 steps · reveal one at a timeStep 1: Understand the speaker
Kavitha is speaking. The phrase "my mother" refers directly to Kavitha's mother. This is our starting point for tracing the relationships in the statement.
Step 2: Identify the daughter
Next, consider "the only daughter of my mother". Since Kavitha is the one speaking, and she refers to her own mother, the "only daughter" of Kavitha's mother must be Kavitha herself.
Step 3: Find the brother
Now, let's substitute this back into the full statement: "He is the only brother of [Kavitha]". This means the person in the photograph is Kavitha's only brother.
Step 4: The answer
So the answer is (A) Brother. The person in the photograph is Kavitha's brother, as he is the only brother of Kavitha herself.
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