I hate having kids in this game, they don't age (Unless they learn the spell from Makin' Magic) and they always have to go to school which is a massive pain in the ass. They also are rather boring as well.
I'm fine with kids, but I hate when they end up having attitude, such as their stats are more lazy/messy/grumpy, or I hate it when they're born with some stupid big old party hat that you can't remove due to it being part of their face.