(((jinnyann)))

Sounds like a lot of family dynamics going on. Have you considered family therapy? Perhaps having all family members (or at least more than just you) working on the established family ways of relating and behaving would be helpful. A friend of mine went to short term family therapy with her teenage daughter, and it really helped them learn new, more constructive and less damaging ways of interacting. Every so often, they go for a "tune up."