I caught my adoptive son having sex with my daughter
About three years ago, we fostered a boy (I will call him Rob) who was 12 then. We fell right in love with him. Rob got along with our daughter (I will call her Sue) who was 13 at the time and she helped him get used to the school. About a year ago, we adopted him into our family. We all got along with Rob including our second daughter, who is a pre-schooler.
A month ago, my youngest daughter and I got home early and we went to the basement, which is a playroom for my pre-schooler. To our shock, we found Rob and Sue having sex. It was embarrassing and disturbing. Rob always seemed like a son to me and a brother to Sue...
I had to tell my husband and he told his mother (who is currently living with us). We talked to Rob and he claims he is in love with Sue and wants to "marry her when he becomes 18". It set off my husband and my mother in law. I told the story to the social worker and she got Rob into therapy. I also had to take my pre-schooler to therapy because the incident traumatized her... Sue and Rob keep saying they are in love and want to "officially date" which we have forbidden.
My husband and mother in law have been seeing Rob in a different light since then and they both want to put Rob up for adoption. I don't want this at all! I have no idea what to do...This is tearing our family apart... Is this normal?