"Do have a situation needing advice on.. Had asked my step son which lives with us part time...asked him to sweep the livingroom floor he had no problem said sure...Dad stepped in said he did not have to do chores...how do I apply rules without involving the (13) child in a stiuation or an arguement???"
Promptly hand the broom to the aforementioned jerk, and then say, "well, you do it then," and walk away.