Family Issues Support Group
Family issues is a huge range that go from minor conflict to major misbehaviour and even abuse on the part of individual members of the family occur. Whether you feel you are in a dysfunctional family or you're dealing with a very specific issue, this is the place to talk about it and find others who might be going through the same thing.
Time is going to fly by. Your sister won't be 13 forever. You'll secure a better job. Your mom will get herself through school. Life will get better. And the days will get better if you and your mom and sister can all sit-down and respectfully let each other know how you're feeling and what you need from each other.
Your mom needs a little help with your sister, you need a little more praise or attention, and your sister needs to become a little more self-sufficient, or at least that's what I'm gathering just from your post. :)
Good Luck! :)