What do i do if my sister have anger problems. need help now please?

Protect yourself: If someone is having a crazy outburst, the best thing you can do for yourself and for them is get away if you possibly can. After the storm is over, talk to that individual and let them know that this behavior is unacceptable. If a person is simply unhappy with others and is telling them about it, try to find out what's really bugging them and perhaps suggest ways to be diplomatic.