E is the son of

The correct answer is: Cousin.

E is the son of A. D is the son of B. E married to C. C is B’s daughter.

This means that E and C are siblings, and B is their father. Therefore, D is E’s cousin.

Here is a brief explanation of each option:

• Brother. This is incorrect because E and D are not siblings. They are cousins.
• Uncle. This is incorrect because D is not E’s father. He is E’s cousin.
• Father-in-law. This is incorrect because D is not E’s wife’s father. He is E’s cousin.
• Brother-in-law. This is incorrect because D is not E’s wife’s brother. He is E’s cousin.
• None of these. This is the correct answer because D is E’s cousin.