To put it mildly, he's obsessed with his legacy. He never actually wanted a daughter, he wanted an heir. He always gave me whatever I wanted, but it always came with a catch. He tried to mold me into exactly what he wanted me to be. I was sixteen when I decided I'd had enough, took my little sister and ran away.
Needless to say, he doesn't like the fact his children gave him the middle finger and left him without heirs.
She's far nicer than I am, but I had to grow up a lot quicker than she did as well. I've done things I'm not necessarily proud of, but I needed to do them so she and I could survive.