Search Results: older brother issues

My 16 year old stepsister and my biological mothers boyfriend have been at it for awhile now. Back in Early February my stepsister accused my bio mother of selling them out over her boyfriend. At that point which my step brother and step sister threatened to hurt and beat up the boyfriend. Now my sister says his son and daughter have come to the house where she lives and the bf has threatened to shoot her just because she was standing outside. As a step brother even though I have never lived with them or seen them much what should I do as a big brother? My sister is bipolar. She has been in DCS custody and was locked up for 2 years for fighting. She often talks about getting turnt up (whatever that means) and wanting to fight and people talking about her. She thinks she is gangsta. My bio mother gave me up after birth. she was on drugs and alcohol during the pregnancy. and we both almost died as a result. Do you think I should try to help resolve the issue or not? Do you think there's more to this issue than what my sister has said.