Read the given information carefully and answer the related questions: M is…

Concept

In a blood-relations puzzle, first fix each person's gender from gender-specific relationship words (father-in-law is male, mother-in-law is female), then build the family tree generation by generation using the spouse and parent-child links. A person's paternal grandmother (दादी) is the mother of that person's father.

Applying it to this family

1. M is spouse of O, and O is the father-in-law of T, so O is male; therefore his spouse M is female.

2. M is a parent of R, and O is M's spouse, so O is also a parent of R. Thus R is the child of M and O.

3. "N is the only son of R, and R has no siblings" tells us R has no brother or sister, so R is the only child of M and O. The person married to O's child (T's spouse) can therefore only be R, so T is married to R.

4. T has two children and N is R's only son, so T and R have a son (N) and one daughter.

5. T is the mother-in-law of P, so P is married to a child of T and R.

6. V is married to P, so V is P's spouse, which means V is the child of T and R who married P.

7. V's parents are R and T. R's parents are O (father) and M (mother), so the mother of V's parent R is M.

Result

The grandmother of V is M.

Cross-check

O is a grandparent of V, but O is male (he is the father-in-law of T), so O is the grandfather; the grandmother must be O's spouse, M. This is consistent.