Quick Solution

To find A's colour preference, we first need to determine the family structure to identify who A is married to. Then we can use the specific colour clues to solve the puzzle.

1. Identifying the Married Couples

A step-by-step analysis of the family relations clues ("A is the grandmother of F", "C is the daughter-in-law of E", etc.) reveals the family structure and its two married couples:

• Couple 1 (The Grandparents): The clues show that A (the Grandmother) is married to E (the Grandfather).
• Couple 2 (The Parents): Their son, D, is married to their daughter-in-law, C.

2. Deducing the Colour Preference of A

The key clue for solving the colours is: "Wife of the husband having a choice for Green colour likes Yellow."

• The only husbands in the family are E and D.
• We know from another clue that C (who is D's wife) likes Black. Therefore, D cannot be the husband who likes Green, because if he did, C would have to like Yellow, which contradicts the given information.
• This means the other husband, E, must be the one who likes Green.
• The clue then tells us that E's wife, who we have identified as A, must be the one who likes Yellow.

Final Answer: The color preference of A is Yellow.