Pointing to a photograph of a woman Rohan says, "She is the sister-in-law of the only daughter of my mother-in-law's husband." How is the Rohan related to the woman?

Brother

Before answering this question we must be aware of the method to solve the blood relation questions. 

For example :

It is now clear, how to make charts in Blood relations. Now, shifting to another type, in this we solve the question in the following manner.