A, B, C, D, E and F are six members of one family. Exactly one married couple in this family has children. A is the son of C, E is the daughter of A, D is the daughter of F, and F is the mother of E. Based on these blood relation clues, which pair represents the parents of the children in this family?

Introduction / Context:
This logical reasoning question is about identifying the correct parents of the children in a small family. We are given information about six members A, B, C, D, E and F, along with statements about who is a son, who is a daughter and who is a mother. The aim is to convert these sentences into a simple family tree and then decide which pair is the parents of the children in the family.

Given Data / Assumptions:
• There are six members: A, B, C, D, E and F.• Exactly one married couple in this family has children.• A is the son of C.• E is the daughter of A.• D is the daughter of F.• F is the mother of E.• Normal family structure is assumed and there is no hidden adoption unless stated.

Concept / Approach:
The key is to identify who is a parent and who is a child, and then to check which two adults form the couple whose children are present. Since F is the mother of E and D is the daughter of F, F is clearly a parent. We also know that E is the daughter of A, so A must be a parent of E. Once we see that A and F together have two children, we can treat them as the single couple with children that is mentioned in the conditions.

Step-by-Step Solution:
Step 1: A is the son of C, so C is a parent of A.Step 2: E is the daughter of A, so A is one parent of E.Step 3: F is given as the mother of E.Step 4: Therefore E has parents A and F.Step 5: D is the daughter of F, and as no second parent of D is mentioned, the simplest and standard exam assumption is that D is also a child of A and F.Step 6: A and F thus form the only couple in the family who have children, namely E and D.

Verification / Alternative check:
If we try any other pair, such as C and F or B and C, we find that the data does not support them as the parents of both E and D. C is the parent of A, not of E directly, and B is never described as a parent. Only A and F satisfy all the given statements without contradiction and match the condition that one couple has children in the family.

Why Other Options Are Wrong:
B and C: There is no information that B is a parent of any child.C and F: C is the parent of A and F is the mother of E, but they are not together presented as the parents of the children.Relationship cannot be determined: The statements are sufficient to identify A and F as the couple with children.D and F: D is explicitly a daughter, not a parent, so this cannot be correct.

Common Pitfalls:
A common mistake is to focus on C because C is parent of A and to ignore the central role of F as the mother of E and D. Another error is to overthink the phrase one couple and imagine more complex arrangements. Drawing a small family chart with A and F as parents and E and D as their children quickly clarifies the structure.

Final Answer:
The couple who are the parents of the children is A and F.