Cut your losses hun. Family is family and even though it isn't fair when one has to tow more of the line than the other at times...we can only hope, that it will be 'repaid' later on in life.

If I were you, I would have a private, Girl to Girl, hang out chat with your brother's girlfriend. Talk about all of the family's problems in the past. Hell if she's living with you guys, she's practically family as it is and should know anyway. Tell her how you feel about your crushing debt and how you only have 200.00 saved to go back to school. How you are trying so hard to help your disabled mom etc. If your brother's GF has any brains in her head, she will understand where you are coming from and will start to make your brother help out and she will start to tow some of that line herself.... If she doesn't understand...she's a freaking moron herself and simply not deserving to be in your family.

What I am saying is...if your brother's GF is willing to work for your family, it shows that she is committed to being a part of it in the future...like in the long term. If she takes everything you have said to her, and trashes it...you have grounds to dismiss her as a "just for now girl". This might actually be a good thing for your sisterly pull in the household!

Good luck girl....

ABT.