Maggie, thank you.

We are all very frightened. Sis swears that he is going into treatment and trying a new med. My youngest niece told us Saturday night that she doesn't want to live in the house if the boyfriend is there. Mum has assured her that both of them have a home with her while we work through all of this. Their father is fine with that, especially since their lives are in Mum's town (school, friends, etc.). However, he is also happy to have them, as am I, as is their father's sister. As far as we're concerned, my youngest niece's statement that "I don't need this again," pretty much says it all. Neither of them do, none of us do.
I know what you mean about feeling inadequate to comment on this. So do I. So do we all. The more we learn, the more inadequate we feel. But we are a strong bunch and as heart-broken as we are, we are determined to find the most positive way through this possible. There is no doubt in any of our minds about the boyfriend's future in my sister's life. The crux is to convince her of that.
Warm hugs,