Q1. Umang said to Uma, "You are the wife of the grandson of my mother." Who is Umang to Uma?
Explanation
Start from Umang's mother. Her grandson, in this setting, is Umang's son. Uma is said to be the wife of that grandson, so Uma is the wife of Umang's son. That makes Uma Umang's daughter-in-law, and Umang is her father-in-law. Father would mean a direct parent-child relation with Uma, husband would mean Uma is married to Umang himself, and grandfather would place Umang one generation higher than the father-in-law relation. These do not match the given relation.
