Not entirely sure what the exact relationship business and personal is with your sister. Why does she control the purse strings, if you're the one making all the products? Have you signed any kind of a non-compete? What's keeping you from bailing on her and doing your own thing? And what about the living arrangements? Is there any possible way for you in the future to maybe get your own place? It sounds like you feel trapped and that is not a good place to be. The solution to this is always action.

The other thing is, I am not, nor have I ever been, in law enforcement. But I strongly recommend that you not share your preference for your sister's demise with anyone. In particular, don't put it in writing, voicemails, or any sort of email or text. Better to just keep those feeling to yourself. You don't want to create a big potential headache for yourself somewhere down the line.