The worst thing a parent can do

To me I would have to say that the worst thing a parent can do is sleep with their childs boyfriend or girlfriend. I just find that apalling on so many levels. It is nasty, distrustful, betrayful, backstabbing and down right wrong. If that were done to me i would call that unforgivable and we just forget the people who ever did it to me was alive. It's just wrong and they should know better.