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Dear All, 

Here, we are going to discuss how we can solve the questions related to blood relations. Before moving ahead with the basics of blood relations, let us discuss some basic symbols to represent various relations in blood relation questions.


We always use + sign for male.

We always use sign for female.
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  1. To show the relation from one generation to another (Mother/Father to Son/Daughter), weuse single arrow head.
  2. To show the relation within the same generation (siblings/cousins), we use single arrow head.
  3. To show the relation between husband & wife, we use double arrow head.
For Example:
1. A is father of B: Here we know the gender of A only. B can either be son or daughter.
111
2. A is mother of B: Here we know the gender of A only. B can either be son or daughter.
112
3. B is the son of A: Here we know the gender of B only. A can either be father or mother.
113
4. B is the daughter of A: Here we know the gender of B only. A can either be father or mother.
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5. B is the wife of A: Here we know the gender of both A and B.
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6. A is the husband of B: Here we know the gender of both A and B.
115
7. A is uncle of C: Here we know the gender of A only.
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8. A is aunt of C: Here we know the gender of A only.
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9. C is nephew of A: Here we know the gender of C only.
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10. C is niece of A: Here we know the gender of C only.
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11. A is paternal grand-father of C:
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12. A is paternal grandmother of C:
122
13. A is maternal grandfather of C:
123
14. A is maternal grandmother of C:
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Blood relation questions can be asked in two different ways.

Type I: In this case, the blood relation is not coded.

Direction: M is the mother of B. A is the husband of M. N is the only brother of B. C is married to N. Q is the only child of C. N does not have any sister. J is the father of A.

Solution:
M is the mother of B.
q1
A is the husband of M.
q2
N is the only brother of B.
q3
C is married to N.
q4
Q is the only child of C.
q5
N does not have any sister (Which means B is definitely his brother).
q6
J is the father of A.
q7

Q.1) If A doesn’t have any grandson, then how is Q related to B?
  1. Can’t be determined
  2. Sister-in-law
  3. Daughter-in-law
  4. Niece
  5. Nephew
Solution: We can see that Q is either the grandson or granddaughter of A. But as per the question, A doesn’t have any grandson which definitely assures that Q is A’s granddaughter. So Q is B’s niece.
Q.2) How is A related to C?
  1. Uncle
  2. Can’t be determined
  3. Father-in-law
  4. Nephew
  5. Brother-in-law
Solution: A is N’s father and C is N’s wife. So A is father-in-law of C.
Q.3) How is B related to J?
  1. Father
  2. Nephew
  3. Brother-in-law
  4. Brother
  5. Grandson
Solution: B is son of J’s son. So B is grandson of J.


Type II: In this case, the blood relation is coded.

Directions: Read the following information carefully and answer the question which follows:
‘A*B’ means A is son of B.
‘A+B’ means A is father of B.
‘A>B’ means A is daughter of B.
‘A<B’ means A is wife of B.
Q.4) What will come in place of question mark (?), if it is provided that M is grandmother of F in the expression ‘F*R<S?M’?
  1. >
  2. <
  3. +
  4. *
  5. Can’t be determined
Solution: F*R means F is son of R.
q8
R<S means R is wife of S.
q9
M is grandmother of F (given already) which means M is either mother of S or R. So we can’t determine the answer for this questions using given options. So answer is 5.
So we have seen two different ways in which blood relation questions can be asked. Sometimes blood relation concept is used in sitting arrangements as well to make those questions more tough. That application of blood relations will be discussed in basics of sitting arrangement. 
All the best...........
Thanks
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