Originally Posted by
Florence 
I'm glad I called. It was way worse than I ever thought. Very dark, very scary stuff. Very dark.
Sister is very likely going to call CPS this week.
If you feel moved to do so you can also report what you know to CPS. You can do that anonymously and while it may not be anything specific it is one more thing CPS add's to their investigation/notes.
And I'd stay well away from her personally.