# Revision Notes for Part A: Mastering the Concept of Blood Relation (Download PDF)

By Renuka Miglani|Updated : December 7th, 2021

Hi Aspirants,

With only a few days left for CSIR NET 2021 exam, you should devote all your time in revising your concepts and topics. Practice as many mocks as you can to work on your speed and accuracy. At this high time, you should practice a lot of questions of those topics which have high chances of being asked in the exam. Blood Relations is one of the important and most scoring topics of the General Aptitude (Part A)  through which one can score full marks in this section.

To help you in your preparation, we have come up with the concept of the Blood Relations for the upcoming exam CSIR-NET 2021. Scroll down the article below and learn this concept to crack the exam.

## Concept of Reasoning: BLOOD RELATIONS

Blood relation questions consist of indirect information given between two persons, and that information can be established by reading all the pieces of information. We can solve the Blood relation question by making the diagram of the information given in the question. Some of the blood relations which are generally used in the question are,

 Mother’s or father’s son Brother Mother’s or father’s daughter Sister Father’s brother Uncle Father’s sister Aunt Father’s Father Grandfather Father’s mother Grandmother Mother’s brother Uncle Mother’s Sister Aunt Son’s wife Sister in law Daughter’s Husband Brother in law Sister’s/Brother’s Son Nephew Sister’s/Brother’s Daughter Niece Husband’s or wife’s brother Brother in law Husband’s or wife’s sister Sister In-law Mother’s father Maternal Grand Father Mother’s Mother Maternal Grand Mother

• We cannot decide the gender of a person by
• We have to decide the sign assigned to males as well as females.

After that, we gather the information step by step and try to make the diagram from the following data

Some Common Type of Questions Asked in The Exam-

1. Direct Blood Relation
2. Puzzle based Blood relation
3. Counting the total number of males and females
4. Coded Blood relation

Below we are going to share the types of series with examples to explain it-

### Direct Blood Relation

1. In a family of seven persons. B is the brother of A and the son of C. D is the son-in- law of C, who has two grandchildren E and F. A is the mother of F and F is the niece of G. E is the son of G. If C has two children, how is E Related D?

1. Brother-in-law
2. Son
3. Cousin
4. Nephew

Ans. D

Sol.

Given text in the question can be represented in the following diagram-

So, C has two children i.e., B and A because its given that B is the brother of A and also A must be a female and married to D because D is the son-in-law of C. Here G might be the cousin of B so E will be the nephew of D.

Hence, option (D) is the correct response.

2. Saksham introduced Nidhi to his friend, “she is the daughter of the only son of my father’s wife.” How is saksham related to nidhi?

1. Brother
2. Cousin
3. Son
4. Father

Ans. D

Sol.

Therefore saksham is the on nidhi . Hence, option (D) is the correct answer.

### Puzzle Based Blood Relation

1. A family consists of six members A, B, C, D, E and F. There are two married couples and three generations. B is a doctor and the father of E. F is the grandfather of C and C is a contractor, D is a mother of B and grandmother of C. How is Contractor related to D?

1. Grandson
2. Granddaughter
3. Son
4. Can’t be determined

Ans. D

Sol. Different symbols used to draw a family tree,

Six members A, B, C, D, E and F. There are two married couples.

As we can see ’s C is a contractor and C’s gender is not definite therefore either C is grandson or granddaughter of D.

Hence, it can’t be determined.

### Counting the Total Number of Males and Females

1. A Family has a man, his wife, their four sons and their wives. The family of every son also has 3 sons and one daughter. Find out the total number of male members in the whole family.

1. 4
2. 8
3. 12
4. 17

Ans. D

Sol.

The male members in the family are: (i) the man himself; (ii) his four sons; and (iii) his (3x4) = 12 grandsons. Hence, total number of male members = (1 + 4 + 12) = 17

2. In a joint family, there are father, mother, four married sons and two unmarried daughters. Three sons have 2 daughters each and one has a son. How many female members are there in the family?

1. 13
2. 8
3. 11
4. 12

Ans. A

Sol.

There are 13 female members in the family. They are;

Mother = 1

Wives of 4 sons = 4

2 daughters each of 3 sons = 6 Unmarried daughters = 2

Thus total will be 13 Hence, option A is correct.

2. In a joint family, there are father, mother, four married sons and two unmarried daughters. Three sons have 2 daughters each and one has a son. How many female members are there in the family?

1. 13
2. 8
3. 11
4. 12

Ans. A

Sol.

There are 13 female members in the family. They are;

Mother = 1

Wives of 4 sons = 4

2 daughters each of 3 sons = 6 Unmarried daughters = 2

Thus total will be 13 Hence, option A is correct.

### Coded Blood Relation

1. A+B means A is the father of B. A-B means A is the sister of B. A*B means A is the brother of B. A%B means A is the son of B. In the expression: T%S*K+D-M, How’s T related to M?

1. Sister
2. Brother
3. Cousin
4. Uncle

Ans. C

Sol.

It's given that: A+B means A is the father of B. A-B means A is the sister of B. A*B means A is the brother of B. A%B means A is the son of B.

Therefore, the expression T%S*K+D-M can be represented as given below in the diagram:

From the above figure, it's clear that T is the cousin of M. So, the correct answer is option C.

2. A + B means ‘A is the mother of B’

A − B means ‘A is the father of B’

A × B means ‘A is the sister of B’

A ÷ B means ‘A is the daughter of B’

If P + R × T − Q ÷ S + U, then how is S related to T?

1. Sister
2. Daughter
3. Wife
4. Mother

Ans. C

Sol. It is clear from the above diagram, that S is the wife of T. Hence, option (C) is correct.

→ If you have any questions feel free to ask in the comments section below.

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