Oh Dan, I am sorry. I thought maybe she didn't like to take her meds during her favorite soap opera.

Sounds like your sister is the problem not your mother.
Any chance of venting on her and her daughter? Or is maintaining the peace a better alternative?

Bastard robs from his girlfriend's sick grandmother. Has anyone called the police? And you did cancel the card, right?
SINS, been there. It ain't pretty.