My elder one is always bullying his sister, how can I improve the situation?

I have 2 boys and the older one does at times bully his younger brother. And sometimes, the younger one does it to his bro too! Here are some ways we as parents can help the situation: 1) Hold kids responsible for their behaviour. Don’t let them justify being aggressive to a sibling. Set limits on what is right and wrong. 2) Referee arguments that get out of hand. Teach your kids to solve conflict without becoming aggressive. Let them work problems out without you, but step in when they cross the line. 3) Identify feelings of jealousy and envy, but teach your kids how to handle those feelings. Get at what is behind those feelings. 4) Reinforce the idea that we are family and take care of each other. You have to model this on the parent level as well. 5) Fill your home with love and nurturing, praising often and tangibly showing love by spending time with your kids. A secure and safe environment goes a long way to preventing bullying.