Living with Family Sucks!!

Does anyone know the pain that I'm going through? I just graduated from school and now live with my mother. There is a name for this...nowadays it is called "Boomerang Generation". At one point, graduation signified freedom...well now...not so much. Well, at least not for me. I was okay with living with my mother and helping her out. However, now there is another element I did not anticipate. My brother temporarily moved back in. I mean...our apartment is small...it is definitely a tight fit. I want to move out and get my own place. The problem is my mother is 65 yrs old and is not currently working. I can't leave her with my brother who has no money and no job. What kind of daughter would I be? I guess I have to suck it up right now.