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 person, a man said to a woman, "His mother is the only daughter of your father."
How was the woman related to the person ?
Daughter of your father -- Your sister.
So, the person's mother is woman's sister or the woman is person's aunt.