Mom is blaming me for my sister bad life?

I’m a grad school student and going to be a lawyer as well. My sister has a troubled teen who is getting straight Fs and wearing all black. Her son is autistic and a hand full. I’ve tried to be nice and give money and give advice but these people don’t like me. My mom now says I’m a terrible person because I want nothing to do with my sister messed up life. My mom screams at me and blames me for not fixing my sister trouble teen.

Mom is blaming me for my sister bad life?
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