We are entering the world where our 3 1/2 year old thinks she can discipline our 1 year old. I have repeatedly told her "we are the parents, you are the children, we will handle the disciplining" but I still hear her trying to discipline her sister. She will try and put her in time out, yells at (aka scares) her, ect. I'm at my wits end because she is super sassy right now and just responds "well i'm the big sister, and i know what is right!" How do you handle a bossy pants