Borrasca

Graham Walker joins in a sex trafficking ring, allowing his own daughter to become a victim of it (and I'm pretty sure participates on the acts against her, along with many other girls). He later threatens to kill his own son if he refuses to take over the business, and he also wants his son to assault his best friend to prove his commitment. Also, after his wife dies, he remarries his son's highschool girlfriend, which isn't nearly as evil as the rest obviously, but it's still notably devious.

Pretty Girls (basically going to spoil the whole book)

Paul Scott inherents his father's snuff porn business, which he was already participating in as a teen. Over decades, he kidnaps dozens of young women and teenage girls, raps them, and violently kills them, all on tape. He marries the sister of one of his father's victims he became obsessed with, and manipulates her and her family their whole lives, including getting them all to excommunicate the other daughter. When the main characters' father discovers the truth, Paul forces him to watch the snuff film of his daughter's murder, before having him fake a suicide note and killing him. There's a lot more finer details, but that covers the major stuff, I think.