While an Area Defense Counsel in Panama, I represented a MSgt who had a months-long sexual relationship with his 12-year-old stepdaughter. The worst thing about the representation was dealing with the family, who somehow thought it was more important to protect him, the breadwinner, than her, the victim. Evil exists.
When I was in the military we had a guy in the squadron who was found guilty of sexually assaulting his own daughter. His wife turned in him. There was talk of her turning him in only because of a divorce. Of course, when he got convicted the family lost everything as well.
Incest (involuntary) between siblings is also one of those crimes that is very rarely prosecuted; between family shame and economics justice goes out the window.
It’s truly a horrible thing.