How do I get my sister to stop acting like a brat? She's 13 and thinks she's about 21.
She's so rude to me all the time and yells at me and my 12 year old sister constantly for everything we do. She acts so sweet when my parents are around so they never think she's a brat. She needs to grow up and quit her attitude. But how do I get her to realize she needs to stop acting like this? She just yelled at me and told me she hates me. I didn't do anything to her.