((((((((((Muffy)))))))))))
I kinda had similar circumstances with my brother. He was a crack head and an alcoholic. Never worked. He lived with my kids and I. I "enabled" him, thats what my T said. Hopefully, during the session your sisters T will know what questions to ask or perhaps you can jot down a few notes beforehand. Either way, its gonna be super hard. I'll be thinking of you and keeping you close in my thoughts.

Dee