UGC NET Study Notes on Blood Relation (Mathematical Reasoning)

By BYJU'S Exam Prep

Updated on: September 13th, 2023

 In the article, candidates will get the complete study notes on Blood Relation, which has an essential role in UGC NET Paper 1 Exam. Along with the study notes, we are providing the tricks and tips to solve the Blood Relation questions that save your time while giving the review in the exam hall.                                                                                                                                                                                                                                                                                                         

  • The question of blood relation will ask in 2 forms basically- Dialogue or Conversation and Puzzles or Symbolically coded.
  • There is certain information that is given about the family member. We need to find the relationship between a particular family member based on the news.

What Is Blood Relation?

Before starting with any strategy, we should know about the definition of the Blood Relation to understand the question.

So, the Blood Relation is a tree or hierarchy of the family structure or relationships, namely- grandparents, parents, children, niece, nephew, etc. Here, the various relationships between the family members of the diverse Generation will give in the form of the question. While solving these kinds of problems, we draw the link of the tree to solve the puzzle by putting different relationships.

In the below table, you can see the typical relationships used in the question of Blood Relationship:

Father’s or Mother’s Son


Father’s or Mother’s Daughter


Father’s or Mother’s Brother


Father’s or Mother’s Sister


Father’s or Mother’s Father

Grand Father

Father’s or Mother’s Mother

Grand Mother

Brother’s or Sister’s Son


Brother’s or Sister’s Daughter


Uncle’s or Aunt’s Son or Daughter


Sister’s Husband


Brother’s Wife


Son’s Wife


Daughter’s Husband


Husband’s or Wife’s Sister


Husband’s or Wife’s Brother


 Blood Relation Questions Based on the Single Person

If Blood Relation Questions asked from the Single Person Based, candidates, have to follow the below steps-

  1. Consider the scenario on yourself, like- Mother’s Daughter would be me, etc.
  2. To find the answer, the sentence will be broken into- “is/as/was.”
  3. Candidates can revert in the sentence form to check the answer.

For Example-

Pointing to a photograph, a lady tells Jaya, “I am the only daughter of the lady, and her son is your maternal uncle.” How is the speaker related to Jaya’s father?

Solution- The relation of the daughter will not exist in this sentence because it is not related to the question asked. Here, the only daughter of the lady- refers to the speaker’s mother.

Speaker’s Mother’s Son = Speaker’s Brother = Jaya’s Uncle = speaker is Jaya’s Mother

Answer– Speaker is related to Jaya’s Father as Wife

Questions Based on Mixed Blood Relation

The Mixed Blood relation is another type of Blood Relation, which is asked in many of the competitive exams. It shows the analytics skills of the candidates. They have to approach right in one go while reading the question. The Mixed Blood Relation problems are also referred to as Chain Blood Relation Problems.

 The questions will be solved with the help of a family tree or diagrams because there is more than one person mentioned. We can use the symbol to avoid confusion while answering the questions.

Following are the symbols used while solving the questions of Mixed Blood Relationship:


Denotes For


Male Candidate

Female Candidate




Same Generation: brother –brother (or) sister-sister (or) sister – brother


Different Generations: father-son (or) mother-son (or) father-daughter (or) Mother-daughter

 In the below points, we are providing you with a list of various generations of a family tree diagram-

  • First Generation- Grand Father and Grand Mother
  • Second Generation- Father, Mother, Uncle, and Aunt
  • Third Generation- Self, Sister, Brother, Brother In Law, and Sister In Law
  • Fourth Generation- Son, Daughter, Nephew, and Niece 


Amit and Punit are brothers, and Sheela and Leela are sisters. Amit’s son is Leela’s brother. How is Punit related to Sheela?

Solution- We will take the first letter of each name of the person mentioned in the question.

Amit and Punit are brother= A+P (as per the symbol for Male Person)

Sheela and Leela are sisters= S-L (as per the symbol for Female Person)

 As the A & P are brothers, we will define them for the same Generation, as same for the S & L.


From the above diagram, it is clear that Punit is the UNCLE of Sheela.

 Answer- Punit is Sheela’s Uncle.

 Some More Examples of Blood Relation Questions-

 Question- A family consists of six members P, Q, R, X, Y, and Z. Q is the son of R but R is not the mother of Q. P and R are married couples. Y is the brother of R. X is the daughter of P. Z is the brother of P. How many children does P have?

(A) 4

(B) 3

(C) 2 (Answer)

(D) 1

Question- A family consists of six members P, Q, R, S, T, and U. There are two married couples. Q is a doctor and the father of T. U is the grandfather of R and is a contractor. S is a grandmother of T and is a housewife. There is one doctor, one contractor, one nurse, one housewife, and two students in the family. Which of the following is definitely a group of male members?


(B) UT

(C) QU (Answer)


Question- A is the son of B, C. B’s sister has a son D and a daughter E. F is the maternal uncle of D. How many nephews does F have?

(A) 1

(B) 2 (Answer)

(C) 3

(D) 0

Question- All the six members of a family A, B, C, D, E, and F are travelling together. B is the son of C but C is not the mother of B. A and C are married couples. E is the brother of C. D is the daughter of A. F is the brother of B. Who is the mother of B?

(A) A (Answer)

(B) B

(C) C

(D) D

Hope you guys now have a better understanding of Blood Relation Questions. If you have any other queries, please comment.

Thank you!

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