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get your sister to help with stuff like that and make sure she does at least as much work as you. if she starts to throw a tantrum and act like a child treat her like a child. tell her she wont get any ice cream if she dosnt calm down and act like a adult.
Or agree to do it all for her if and only if she does something for you that sucks just as bad if not more to do. Maybe do some cleaning and yardwork. something simple that anyone can do and noone wants to do. toilets need to be cleaned maybe? Wash your car? bound to be something you dont feel like doing yourself.
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