I have to agree with you on this one. When they were engaged, she was just graduating from High School, and he was pretty young, too. He was more mature than her, but he'd been a serious student all that time, and he was absolutely sure what HIS plans for the both of them were. He hadn't experienced life except as an almost grim workaholic student, and didn't really understand women at all. I can remember being that age, and being absolutely certain of all my convictions and opinions. Luckily, my wife was definitely NOT a meek person who felt that her husband was always right! It changed me a lot for the better. Had I been stubborn as a mule about things, my marriage would not have worked out. I was also lucky that my father had basically told me that marriage was a partnership, and that if I decided to play the know-it-all paterfamilias, I would fail as a husband.
I liked it but it made me kinda sad >.< to have missed so many years.
Regarding the previous comments: I don't think there's anything wrong with Simon's crush on Hetta. He's still a kid, and saying there's something strange about it makes it something it isn't. And why should his father reprimand his shy son, who is just beginning to bond with him, for something like this? 1. who knows what will be in 10 years and 2. even if he still loves her more as a stepsister, they are not related by blood, so no incest.