In decipher jumbled up description type of questions, a round-about description is given in the form of certain small relationships and direct relationship between the persons concerned is to be deciphered.
Pointing to a man on the stage, Rita said, "He is the brother of the daughter of the wife of my husband."
How is the man on the stage related to Rita ?
Wife of husband -- Herself,
Brother of daughter -- Son.
So, the man is Rita's son.