(i) In a family of six persons A, B, C, D, E and F, there are two married couples.
(ii) D is grandmother of A and mother of B.
(iii) C is wife of B and mother of F.
(iv) F is the grand daughter of E.
Who among the following is one of the couples ?
C is wife of B. So, one couple is BC.
Now, D is 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 grand daughter of E.
So, E is the grandfather of F and the husband of D.
Thus, DE is another couple.