Dang, divorced mother of three kids and she has the luxury of not working? Can I sign up for that gig?

I actually think it's probably best for you to MYOB in this case. I have a brother who's not too dissimilar to your sister and the best thing is for my mother, IMO, to learn the hard way what he is. Seriously a grown woman hanging up on her mother and refusing to try to resolve the situation? That's exactly as you said, seriously spoiled brattiness. Stay out of it or somehow it will end up being you that gets the short end of the stick.

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