Nicholas' family might be suspicious and keeping quiet so that everything can be investigated or a body turn up. Unless Nicholas is starting a brand new life with a new name there's no reason for him to stay hidden for months. He could surface, get a divorce, pay child support, and go on with his life. It doesn't make sense for someone to lose their degree, work history, and whole family just to run out on alimony or child support. Looks like it would cost more financially in the longrun to lose all that. Maybe the accusation of the family knowing is just a way to keep them away from the grandkids and from snooping around.