Suggest Help For Extreme Mood Swings, Abusive Behaviour, On And Off Physical Abusiveness

i have a sister who has a horrible seemingly uncontrollable temper. She can go from being very amicable to just verbally abusive within seconds or minutes. During these outbursts of anger she yells loudly, uses profanity that would put an old sailor to shame, says demeaning or disrespectful things, tends to repeat herself, and goes on and on without allowing the other person to speak. She never apologizes for these outbursts, and often talks this way to me in front of my children and young grandchildren. On at least one occasion she physically assaulted me. She behaves like a horrible bully and I am concerned about her being around my mother who is 83, because she talks to her in a way that is also disrespectful.