They have phases. Anoreth was a nightmare from 13 to 15, but she’s reverted to human at 16, except for the bizarre hair color thing.
At 13, Bill’s impossible about half the time, and I understand that’s likely to increase most of the time when he’s 14. (We’ll try marathon training ...) I don’t know what happens after that; my brother seems to have never gotten much past 14.
I should mention the possibly relevant information that I had two pregnancies/babies during the years Anoreth was 13-15. This may color my memories!
Since I’m not pregnant now, Bill may be wonderful when he’s 14!