Your sister is bullying you financially and anyway she can to control you. I have an older sister myself that has been extremely toxic towards me and she lies and manipulates and is a total control freak. I have a long thread about how horrible my sister has been, basically stealing from my elderly parents and blaming it on me. My parents both passed away this year and she was absolutely horrible about me trying to say my goodbyes to my own dying parents. I could go on and on about it all and quite honestly, I think my sister is actually CRAZY. So I can definitely sympathize with your predicament.