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Blood relations

Shubham Agarwal
Last Updated: May 13, 2022


Logical thinking is essential since it assists us in making crucial decisions, solving problems, coming up with new ideas, and setting objectives, all of which are necessary. 


One of the most critical topics in logical reasoning is Blood Relation, which is included in almost every exam. This topic puts students' analytical skills to the test, as well as their approach to problem-solving. 


Questions of this topic are based on the concept of 'Relations.' To answer the questions, you must have a thorough understanding of the blood relation. In this blog, we’ll be explaining everything about Blood Relations and potential problems on this topic.


So, let’s get started!

Blood Relation

As we all know, a relationship is a link that exists between two things or two people. So, when we talk about blood relations, we're talking about a link between two people that is based on blood or, more simply, birth.


Furthermore, marriage brings two people or two families together. Therefore the relationships formed by marriage are also considered blood relations.


Let’s see the basic types of relations.

Types of Relation

To solve any problem on Blood Relations, we divide relations given in problem into majorly two types :

  • Paternal Relation.
  • Maternal Relation.

Paternal Relation

Relations on the father's side are known as paternal relations. Refer to the table below to see some of the paternal relations.


Maternal Relation

Relations on the mother's side are known as maternal relations. Refer to the table below to see some of the maternal relations.



Name of the Relation
Mother’s father Maternal Grandfather
Mother’s mother Maternal Grandmother
Mother’s brotherMaternal Uncle
Mother’s sisterAunt 
Children of maternal uncle Cousin
Wife of maternal uncleMaternal Aunt
Children of the maternal aunt Cousin 
Husband of the maternal aunt Maternal Uncle 


Other Important Relations

Apart from paternal and maternal relations, some other relations also exist, such as:


  • Son’s wife → Daughter-in-law 
  • Daughter’s husband → Son-in-law 
  • Husband’s (or) wife’s father → Father-in-law 
  • Husband’s (or) wife’s mother → Mother-in-law
  • Husband’s (or) wife’s brother → Brother-in-law
  • Husband’s (or) wife’s sister → Sister-in-law 
  • Sister’s husband → Brother-in-law 
  • Brother’s (or) sister’s son → Nephew
  • Brother’s (or) sister’s daughter → Niece

Relation of Generations

When dealing with such a situation involving a family generation, always keep the generation of one individual at one level.


Refer to the diagram below for a better understanding.



We've learned quite a bit about blood relations now; let's move on to learn how to solve them.

Symbols for Solving Age relation in Blood Relation

The following symbols are assigned to people in the problem statement while solving the problem of blood relations.



Types of Problem on Blood Relation

Given that blood relations is one of the most common concepts from which questions are formed. The following are the various ways in which blood relation questions may be asked in competitive exams.

Type:1 Problem-based on a Relationships

Question: Pointing to a lady on the stage, Sonali said, “She is the sister of the son of the wife of my husband.” How is the lady related to Sonali? 



Text elaboration:

My husband = Sonali's husband, Wife of my husband = is me = Sonali Son of the wife of my husband = My Son Sister of the Son of the wife of my husband = My Son's Sister = My daughter So, the lady on the stage is Sonali's daughter. 


Type 2: Puzzle type questions with a family relationship component


Question: A family consists of a husband and wife, three sons and two daughters, three wives of three sons. How many females are in this family?



Text elaboration:

Husband wife (female)

Three sons = S1 S2 S3 and two daughter = D1 D2 

Son’s wives = W1 W2 W3

So, the total number of females = wife + D1 + D2 + W1 + W2 + W3 = 6 females. 

Let’s move on to some of the frequently asked questions on Blood Relations.


Frequently Asked Questions:


Q 1: What Strategy is used for solving the blood relation problem?

Answer: Venn Diagram Creation is used for solving the problem of Blood relation.


Q 2: What are the major two types of blood relations used in the problem?

Answer: The Two Major Types Of Blood relation used is Paternal and Maternal.


Q 3: Describes the various relation of generation.

Answer: Generation 1 -----Grandparent.

        Generation 2 -----Parents

        Generation 3 -----Sister, Brother

        Generation 4 -----Son, Daughter


Q 4:What are the various symbols assigned to various people in the statement?

Answer: Male       -------(+)

        Female   -------(-)

        Couples  -------(<=>)


Q5: What are the significant steps taken to draw the Venn diagram of Blood Relations.

Answer: Step 1-Assign the people based on generation

        Step 2-Designate the Relationship B/w Each entity of the Venn Diagram


Key Takeaways

In this blog, we’ve covered the problem of Blood Relations with the help of the Venn diagram. We also learned how to differentiate between paternal and maternal relationships.

You can use CodeStudio to practise questions on blood relations and use the Coding Ninja Self-paced Aptitude Preparation course to grasp numerous Aptitude concepts.

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