Reasoning : Blood Relations Problems with Shortcut Methods - Introduction

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Friends, in today's lesson I am going to teach some basics of Blood Relations of Reasoning Section. In such type of tests, the information about the blood relations of a group of persons is given in jumbled form. The candidate is asked to as certain the relationship between any of these two persons on the basis of the information provided.

For this, a clear picture of the well defined blood relations in the society is imperative. Some of relations obtaining in the society have been given in the following table.

	Grandfather’s Son		Father or Uncle
	Grandmother’s Son		Father or Uncle
	Grandfather’s only Son
	Grandmother’s only Son
	Mother’s or Father’s Mother		Grandmother
	Mother’s or Fathers Father		Grandfather
	Grandfather’s only daughter-in-law
	Grandmother’s only daughter-in-law
	Mother’s or Father’s son
	Mother’s or Father’s daughter
	Mother’s or Father’s brother
	Mother’s or Father’s sister
	Husband’s or Wife’s sister		Sister-in-Law
	Husband’s or Wife’s brother		Brother-in-Law
	Son’s wife		Daughter-in-Law
	Daughter’s husband		Son-in-Law
	Brother’s Son
	Brother’s Daughter
	Sister’s husband		Brother-in-law
	Uncle’s or Aunt’s Son or Daughter
	Brother’s Wife		Sister-in-Law

Relations from one Generation to Next :

Now let's have a look at some Practice Problems on Blood Relations along with explanations. HappY Reading :)

Ex 1 : Poiting to a man in a photograph, a man said to a woman, "His mother is only daughter of your father." How is the woman related to the man in the photograph ?

1. 
2. Sister
3. Mother
4. Wife
5. Daughter 
6. Aunt 

Solution : 

From the information given in the question, it is clear that, the only daughter of the woman's father is the woman herself, and hence the man in the photograph is her son. Therefore, the woman is the mother of the man in the photograph. Therefore, the correct answer is (2).

Ex 2 : Pointing to a man in a photograph, a woman said "The father of his brother is the only son of my grandfather". How is the woman related to the man in the photograph ?

1. Mother
2. Aunt
3. Daughter 
4. Sister 
5. Niece 

Solution : 

From the information, it is clear that the only son of woman's grandfather is the father of the woman and the father of the man's brother is the father of the man. On combining these two information together single information emerges that the man's father is the woman's father. Hence, the woman is the sister of the man in the photograph. Therefore, the correct answer is (4)

Ex 3 : Introducing Asha to guests, Bhaskar said, "Her father is the only son of my father". How is Asha related to Bhaskar ?

1. Daughter 
2. Mother
3. Sister
4. Niece 
5. Aunt 

Solution :

The only son of Bhaskar's father is the Bahskar himself. This means that Bhaskrar is the father of Asha. Hence, Asha is the daughter of Bhaskar. Therefore, the correct answer is (1)

Ex 4 : Akash said to Mohit, "That boy in blue shirt is younger of the two brothers of the daughter of my father's wife. "How is the boy in blue shirt related Akash ?

1. Father
2. Uncle
3. Brother
4. Nephew
5. Grandfather 

Solution : 

The daughter of Akash's father's wife is the sister of Akash and brother of the daughter is the brother of  Akash. Hence, the boy in blue shirt is the brother of the Akash. Therefore, the correct answer is (3).

Ex 5 : 'SxT' means that S is the mother of T. 'S+T' means that S is the father of T. 'S-T' means that S is the sister of T. On the basis of this information, you have to select the  option which shows that A is the grandfather of T. 

1. A+S+B-T
2. AxB+C-T
3. A+C-T
4. A+B-CxT
5. A-CxT

Solution : 

Option (1) represents that A is the grandfather of T

• i) B-T --> B is the sister of T.
• ii) S+B --> S is the father of B, hence S will be father of T (from information (i))
• iii) A + B --> A is the father of S, hence A will be grandfather of B. 

Ex. 6 : If 'P$Q' means that P is the father of Q. 'P =! Q' means that P is the mother of Q, 'P*Q' means that P is the sister of Q. Then , how is Q related to N in N=! L $ P * Q ?

1. Grand - Son
2. Grand - Daughter 
3. Nephew
4. Data inadequate 
5. None of these 

Solution : 

In the above question, the sex of Q is not given, hence exact relationship between N and Q cannot be established. In other words, we can say that data is not adequate to answer the question. Therefore, the correct answer is (4).

Ex 7 : If 'P+Q' means that P is the mother of Q, 'P %Q' means that P is the father of Q, 'P-Q' means P is the sister of Q. Then, which of the following relationship shows that M is the daughter of R ?

1. R % M + N
2. R + N % M
3. R - M % N
4. Data inadequate
5. None of these 

Solution : 

M + N i.e., M is the mother of N, hence, the sex of M is determined as female. R % M i.e., R is the father of M. Hence, R + M + N clearly mean that M is the daughter of R. Therefore, the correct answer is (1) 

That's all for now friends. In my next lesson, i will share few more blood relations problems with higher difficulty level. Happy Reading :)

Shared by Jyothula Suryaprakash

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