I've seen a couple of mentions of Chris's gender identity perhaps becoming a legal hurdle in making the incest charges stick.
Apparently, the state of Virginia doesn't recognise Mother/Daughter relationships as incest, so it's not illegal. Barb's mental state being an unknown as of right now, we don't know if this was consensual or if she is able to consent. The only thing we know for sure is Chris broke the EPO.
Would something like this require a Supreme Court ruling to decide if gender and biological sex can be considered legally distinct, or could a Judge just say "Fuck it" and set the precedent themselves?