[scratchmonkey]

Crusader Kings I and II, the traits of your offspring are not only derived partially from those of the parents; children are also molded by their primary caregiver, to the point of gaining that caregiver's culture -- if you choose to raise your children yourself, there's also a series of events where you have some control over how your children might turn out.

More broadly, the game really is about constant maneuvering in order to best position your dynasty for the future.