Pointing to a man in a photograph a woman says, “He is the father of my only daughter-in-law’s father-in- law”. How is the man related to the woman? ​​

Given: 

Pointing to a man in a photograph a woman says, “He is the father of my only daughter-in-law’s father-in- law”.

Man is father-in-law of woman.

Thus, correct option is (b).