Who the hell is this guy to be spanking u!!!??
his not even ur dad. he seem like a controlling psychopath, your aunt is right u should tell ur parents. Tell your sister to get off her butt and tell her husband to stop hitting you..most people would consider it to be physical abuse.
Your cleaning up and evreything..what is his problem..seriously if i were u, and this maniac spanked me like, i was some sort of rag doll, my fist would connect with his cheek.
Make sure you tell ur parents, ur brother in law is acting like some sort of chief of the household..jheez, how old are you, 5?.
You should go and live with ur aunt, or stay at a friend's. till ur parents get back, this loser has no justification of spanking u.
good luck xxx