I mean, outside of NXIVM, there's the story of that girl kidnapped and molested several times by a neighbor who also manipulates her parents (and has sex with both of them) so they don't quite get what's going on with their daughter. Here, Keith clearly manipulated Dani's whole family, including having sex with the sisters, so it doesn't surprise me at this point that the parents were talked into siding against their daughter by Keith. I initially was surprised by Keith getting life in prison, but after hearing all this, it's very fitting