<human>: Hi, sorry if I do something wrong this is my first time posting here. 

My older sister (21) has been abusive towards me (19), my little sister (16) and both my parents (both 46). Often what happens is that there is a flare up and she physically assaults someone at one of my family members insults at them. A couple of years ago she was abusing me fairly often but now she's moved on to my little sister. My older sister keeps saying that my little sister is a worthless human being as that she has no respect for her and that she wants to hurt her. Tonight my little sister was thrown to the ground a kicked repeatedly. I'm so worried and scared for my little sister. My family are not sure what to do.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: My older sister is abusing my family and I worried for my little sisters safety, what can me and my family do?