Pointing to a boy in the photograph, Reena said, 'He is the only son of the only child of my grandfather.' How Reena is related to that boy? MCQ with Answer and Explanation

Explanation:
P ÷ Q → P mother of Q. Q – S → Q father of S. S + K → S brother of K, so K is also son of Q. K – T → K father of T. T × R → T husband of R. K is father-in-law of R (true). S is brother of K, T's father (true). Q is father of K, so father of T's father (true). P is mother of Q, so P is grandmother of K, not mother of K's mother. Hence C is incorrect.

Explanation:
L & M → L wife of M. M # N → M brother of N. N @ A → N daughter of A. A & B → A wife of B. So A and B are parents of N. M being brother of N is their son. Thus L is daughter-in-law of A and B. B # C → B brother of C, so C is sibling of B. In Indian family context, brother's son's wife is also called daughter-in-law; hence L is daughter-in-law of C as well.

Explanation:
S is T's wife → S female. Q is sister-in-law of S and wife of R → Q is wife of S's brother R. So R is brother of S. U mother of S → U mother of R also. P father of R → P husband of U, father of S and R. Thus P is father of S, so father-in-law of T.