(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.
Which of the following is true ?
The sex of A is not known.
So, neither (a) nor (b) is definitely true.
Clearly, Dis the grandmother of A and F.