I've always worked even when I didn't need to and I'm always helping out at my mother's house by paying for repairs or even for groceries frequently. Although I do work a lot, my contributions are not only financial since I help my siblings with homework, shores, and many other things.
Doing what you can makes people feel like they can count on you. Your family is supposed to be that way and helping out makes people want to keep you around and do the same for you. Setting a good example is never a bad thing and inside my family, it is spreading.