JJJ,
In this instance, as in many others, our GsFGs disorders are a family issue. The family is paying the price for choices/impulsive actions taken by your boys.
I'm sorry for that. I'm sorry that the center cannot separate your girls from actions (deliberate or otherwise) taken by your boys in that facility.
As a parent, you've done everything possible & have done a good job making your difficult children accountable. (Loved the letters of apology.)
Keeping fingers crossed that there is a change of heart for your girls.
