I love my wife's Mum, she's clever , funny, kind, and really has a zest for life and travel, she's brilliant and was one of the few people in my wife's close circle who didn't warn her off me when we first got together. I think she's great.
My wife and my own mother however HATE each other. That's not an exagggeration at all, they only have to be within 100yds of each other and you can cut the air with a knife ( not that we leave knives lying around when they have to be tgether, you know , just in case...)