I read the manga (the first two, at least: I'm not sure if there's more by now) and have decided to ignore their existence. Sarah was all droopy!

Anyway, I think your right: Jareth may need a large rambunctious family filled with siblings and cousins who visit all the time, (except when he's babysitting a wished-away, unless it's to drop of their own babies so he can babysit them too) and aunts who tell him to clean up his messy, messy castle.