Are you alright? Pretty sure none of what I said was in a foreign language. For a start, incest is legal in some parts of the world. Even then, people are always doing things against the law unpunished. People will always break the law, there is nothing you can do about it. As I said, it is likely that this will not last forever or result in a child. The only real problem I would have with that is the judgement placed on that child from others.
Neither party are being forced into a relationship, and I'm assuming it isn't at all sexual at the moment so no crime is being committed. If you need help decoding anything else anytime soon gimme a shout