Blood Relations Questions

A is a male and married to B. So, A is the husband and B is the wife. C is the brother of A. D is the son of C. E. who is the sister of D will be the daughter of C. B is the daughter-in-law of F whose husband has died means F is the mother of A. 

Clearly. E is the daughter of C. 

A is the sister of B and B is the daughter of C.

So, A is the daughter of C. Also, D is the father of C.

So, A is the granddaughter of D. 

Daughter of uncle's father — Uncle's sister — Mother;

Mother's son — Brother 

Daughter of your father — Your sister. So, the person's mother is woman's sister or the woman is person's aunt. 

Since Harsh has no brother or sister, so he is his father's only son. Now, wife of my father's son — my wife. 

So, Harsh's wife is the man's mother or the man is Harsh's son. 

Brother of mother — Uncle: Uncle's son — Cousin

C is wife of B. So, one couple is BC. Now, D in grandmother of A, B is the son of D and his wife C is the mother of F. SO, D is also the grandmother of F But F is the granddaughter of E. 

So, E is the grandfather of F and the husband of D. Thus, DF is another couple 

P, Q, R are children of same parents. So. S who is R's mother and T, who is R's father will be mother and father of all three. 

However, it is not mentioned whether Q is male or female So, D cannot be definitely true.