A, B, C, D, E and F are six members of a family. A is mother of B, who is the husband of D. F is the brother of one of the parents of C. Dis the daughter in law of E and has no siblings. C is son of D. How is C related to A?

A is the mother of B

B is the husband of D → so D is B’s wife

C is the son of D → so B and D are the parents of C

Now:

D is the daughter-in-law of E
→ So E is the parent of B (since D is B’s wife)

D has no siblings (not directly needed further)

F is the brother of one of the parents of C
→ Parents of C = B or D
→ So F is the brother of B or D (extra info, not critical here)

We already know:

A → mother of B

B → father of C

Therefore, A is the grandmother of C or C is the grandson of A