Where is the justice you ask? There is none. Sorry. Sometimes people are products of people who are too closely related and shit like this happens.
Every year childless couples spend millions of dollars to have children. They take fertility shots, endure IVF, artificial insemination, surrogacy, egg donations, adoption, scoop up fetuses from the bottom of abortion clinic floors- anything to have a child. Good people. Hard working people. People who don't beat their spouses people. People who need people, people. Who just want to have a baby, people. Then there are some people who after a few shots of Jagermeister, a 12 pack of Pabst Blue Ribbon, a couple hits of meth and a Faith Hill song are doing their part to ensure trailer parks are never empty.