You have to look at mom to get an idea whats in store down the road.  Chances Mom may be a little overweight too.  I was attracted to this gal in my twenties but her mother was huge so I backed off.  Twenty years later we met up at a reunion and it was incredible as she was even bigger than her mother.

If size is an issue take a close look at the family members, but in reality it should not really make a tinkers dam.