angel it sounds like your mom made her choice, let her live with the choices she made, the stroke is unfortunate but dont let her use it has a guilt trip against you.

it sounds like your sister can do no wrong in the eyes of your mom, dont blame yourself for any of this, it is not your fault, there was/is nothing you can do, or could have done to change the past, dont let them ruin your future with these petty mind games.

i know it is your mom, and you are worried about her wellbeing, but like i said, she chose her favorite and it is unfair to guilttrip you into taking her in after realising what your sister has/is doing to her.

no mother should ask a child to do that, she is the one that is wrong not you.