You can do it if you need to. We had to kick my son out when he was 18.... We let him come back at one point and had to kick him out again. Not sure what we would have done if we didn't have a younger daughter, but for her sake and well being we had to stick to our guns. Eventually we had to let him be homeless and live on the streets in the middle of winter. It was awful, really awful but I still think we had to do it.
We have for a long time takent he stand we will help you and support you when you are wanting to get help. So at times when he wanted in from the cold he went for help... And each time I think it did give him something. And that is still our stand and he knows it..... So this last time when he relapsed, he was honest and went into residential treatment before we even knew for sure he had relapsed!
