If I may ask.. how old are you? How old is your sister? Your parents? When were they diagnosed? Have either of them been like this before, or is it solely since they got sick?
It sounds to me like they are getting fragile and scared, and money is probably a huge issue for them. Perhaps it's medical bills, perhaps they are afraid of dying and leaving you nothing. They are likely terrified that they both might get sick and die without any kind of backup. They probably either need the money they stole and are too embarassed to admit it, or they are just being money-grubbing jerks.
I would have a very frank discussion with them about it. Money makes people do weird shit, and well... so does thinking you're going to die. If it were my mom, I'd be asking "look, is it that you need the money? I'm willing to help, but you've got to be honest with me. How bad is it?"
If they can't talk to you about it, and continue like this, I'd lay it out for them. Let them know this can't continue. And probably get out. At least if you had your own apartment, your sister would have someplace to hang out and do homework until she had to go home.
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My heart knows me better than I know myself, so I'm gonna let it do all the talkin'.
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