How to I handle a mom who plays victim and a brother who enable her bad behavior?

Mom spent last year eating herself to death now it's to the point she's 275 pounds and can't walk. My older brother last years was yelling at everyone for hiding food from my mom. My mom would eat 3 bags of Jumbo size chips everyday and McDonald's. My mom now upstairs crying that we barly help her when all we want is for her to get off her ass and workout.. it's so bad she pees in a cup now.

2 years ago my mom was sick from cancer that refuse to take care off I spent 1000s of dollors buying her health food and people use to sleep in a chair in a room for 24 Horus a day.
How to I handle a mom who plays victim and a brother who enable her bad behavior?
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