Oh Linda, I know that this is such a hard step to take. I know that you have NEVER wanted this outcome, but reality is that it may be what YOU need right now. You have poured your everything into the tweedles, this health crisis may be a result of the constant, non-stop, unbelievable pressure cooker you have lived in.
I have serious health issues, which include major pain (and pain management issues such as rest, staying still, seriously major medications that many people have given me grief for). I know part, a very small part, of what you have gone through and are going through. I know that living with the threat of physical violence will make healing your body impossible.
Just because kt goes to a residential facility now does not mean you do not love her. It means you love your entire family enough to take the steps you need to in order to preserve it long run.
I stepped away from day to day ANYTHING with my difficult child. Had to. You know I had no choice. I could have dragged it out, but it would have messed up the other 2 kids. I won't kid you. It hurts. It was more than a year before I could even look at his baby pictures (and my littlest looks so much like him that some of his pictures made me cry). I cried and screamed and raged for quite a while. I kept it to myself, only when kids were in school or out with husband. I did cry muchly with husband.
You and your husband may need couples therapy to help with this step, whatever direction you decide to go with it.
I know, as will your children when they are mature enough, that you have already walked through the fires of H to save them, that you and husband have done everything humanly possible. And that your love for kt and wm will never end, no matter what addresses you all have.
Very Gentle Hugs,
Susie