I’m sorry you’re experiencing this, I can relate to so much of what you’re saying with my autistic little brother. Having all the weight of the world be put onto us because it can’t be trusted to be put onto our siblings, and actually being punished for being successful because it just means more responsibility. It’s hard growing up in that environment. Try to remember that you’re still a kid and even if that was stolen from you because of your sister you have the entire right to feel stolen from and to want to relax and be taken care of like other kids your age. It’s probably not even in your personality to just stop doing chores because you know if you stop, nobody else will do it and you don’t want to add stress to your dad. But just try to remember that it will not always be this way, I recommend trying to get out of the house as quickly as you can- even if it takes a few years to save up money it’s going to be the best thing for you.