Correct option is C
X says to Y, "I am neither your son, nor your father."
· This means X is not directly in the parent-child relationship with Y.
X says, "I am not your wife's brother, but I am related to him."
· This indicates that X is related to Y's wife's brother, but is not the same person.
X says, "I am the grandson of the father of your wife."
· The father of Y's wife is Y's father-in-law.

From the above family diagram Thus, X is Y's wife's brother’s son.
Correct answer is (c) Wife's Brother’s Son.