Teach your child to breathe deeply in through his nose and out through his mouth to the count of 10 when he feels angry. This will relax him and give him time to think before acting. Model using this technique yourself and, at the same time, express your emotions clearly and calmly. Some children are taken advantage of because they don't stand up for themselves - then they become angry. Show how to take turns and trade.
Many problems arise when siblings want to use the same toy, ball, clothes, or whatever.
Teach children how to take turns or to trade one thing for another. It helps to use an impartial aid such as a kitchen timer to let a child know how long she has to wait before she gets a turn. Teach children how to care. Teach your children to consider each other's feelings. Any solution to a problem they decide on needs to take feelings into account.