@KUROKURO I'm single child but with bad ideas.. so is ur sis single? If yes , then get urself a temporary bf , ur sis will try to get one as well ( like she did with ur friends) , once she's busy it'll be over for a time. Or ... Gather up courage and talk back / criticism first where she can't raise voice / scold u directly, start from tiny ammount... Like they'll not understand if it's insult or not