Deducing the Married Couples

We can identify the two married couples by systematically analyzing the relationships provided in the clues.

Identifying the First Couple (Parents' Generation)

The clue "C is wife of B" directly and explicitly states that B and C are married. This establishes the first couple.

• Couple 1: (B, C)

Identifying the Second Couple (Grandparents' Generation)

We can deduce the second couple using the remaining clues:

1. The clue "D is the grandmother of A and mother of B" tells us that D is B's mother.
2. The clue "F is granddaughter of E" tells us that E is a grandparent of F.
3. Since F is the child of B and C, F's grandparents are the parents of B and C. We already know D is B's mother, which makes her a grandmother to F. Therefore, E must be the other grandparent from that side of the family, which means E is D's husband.

This establishes the second married couple.

• Couple 2: (D, E)

Conclusion

The two married couples in the family are (B, C) and (D, E). Reviewing the given options, the pair DE is listed.