Well, for me before I marry a guy, I have to like his family or
at least find his family bearable
See the thing about me is that I may be patient and tolerant but
once I reach my snapping point, all hell breaks loose and things
tend to turn really ugly and nasty, so to prevent any ugly
situations, I always make sure I like his family first.
I guess in a way, subconciously I tend to choose guys who are not
close to their families just to be on the safe side 
Anyway he avoids all of his family functions like a plague so I
don't have to worry about that. He will tell me off if I encourage
him to go 