Blue, I totally could not deal with your sister's behavior. Imagining myself in the situation... me:"WTF is your problem, you ever-ingrateful *****?!" Her:"stay out of it!" Me:"Let me know if you ever decided to get your **** together and grow the **** up. Till then, that's it. I'll have nothing to do with you. There. I'm out of it.". Aaaand walk.

You're far more patient than me. My heart goes out to you Blue, it really does.