Hello my 5 year old dd is very mean to her little 2 year old brother. They constantly fight over each other's things. What are some good ways to teach them this is not okay. My dd will hit her brother and then he will come at her either biting or pulling out her hair. It's hard for me to control them at times so I just yell or give time outs but it doesn't work b/c they are still doing it. What do you all do when something like this happens..what works..i need answers desperately.