This sparked a crazy idea. What if your children were uncontrollable and did unexpected things? Your son risks getting himself killed fighting monsters, or your daughter experiments with lesbianism. You can try to control them, but they might hate you for it.
I just got Beta 3 the other day, so I haven't gone much beyond the first few turns yet--not sure how children work as of now. The Guild had a pretty cool system. Also, an old Sega Genesis RPG, Phantasy Star 3. It would be cool if you could completely lose control of your children, such that they become anonymous townspeople, soldiers in your army, or even rival sovereigns; but at the same time you could take control of your chosen heir when you retire (or die), inheriting his/her both random and gameplay-driven generated history for roleplay value.