Step 1: Understanding the Concept:
Determine the gender of each family member based on the descriptors "son," "daughter," and "mother."
Step 2: Detailed Explanation:
- A: Male (Son of C)
- E: Female (Daughter of A)
- F: Female (Mother of E)
- D: Female (Daughter of F)
- C: Parent of A (Gender unknown)
- B: Spouse of C (Gender unknown)
Step 3: Calculation:
We have 3 confirmed females: E, F, and D. Since C and B's genders are not specified (one must be male, one female to be a couple in standard logic), there could be a 4th female. However, given the standard choices, we count the confirmed members.
Step 4: Final Answer:
There are at least three confirmed female members. Thus, the correct option is (b).