Ok, this will be long but here it goes. I am 20 my twin sisters are 16, they are friends with a girl I think is 16 as well. They have been in school together since like the 3rd grade or something close to that. When this girl started coming around she came from a great family mom and dad very actively in their church along with their daughter we will call her *Jen* (sis friend and only child). My family and their family have always got along well though I always thought something was off about them. They have been friends awhile, fast forward about 5 years they are all starting high school and I just out of high school. I used to babysit Jen when they would come home from school and before we all got on the bus in the morning. Jen's parents, around her 8th grade to 9th grade year get a divorce, her mom ran off with another guy. So her dad takes care of Jen now. Well not so long later in her freshman year her dad starts drinking, so now hes an alcoholic. Her dad and Jen have since had to move in with her grandmother (his mom) in the county next too us, which isnt bad my sisters and Jen still go to the same school. This is not turning into something very good for Jen at all, she has to take care of her drunk father more times than I can count. She also takes care of her grandmother when she is sick and her mom I dont think is much in the picture from what I understand. So to me she is raising herself. Jen is bulemic and or anorexic, she has started coming back over to the house before her dad gets off work. She ate a handful of cherrios the other day and not even 30 min later heeved them up in our bathroom, saying it didnt sit well on her stomach. She is also boy crazy. She basically opens up for any guy that will give her .5 seconds of attention. This is very dangerous for any woman to do especially when a teenager. She gets involved with these guys and says stuff like "we are going to get married and I'm going to have his babies and live happily ever after." But ends up breaking up with them and moves on to the next guy. Now the problem comes in is my sisters. Ive never really thought of Jen as being a great friend to my sisters, I find her quite annoying. But she is one of only like 4 friends my sisters have combined. They are very anti-social (no people skills) and can seem "slow" at times but one of my sisters carries a 4.0 GPA and the other well we just wont go there. I dont want Jen's behaviours to start wearing off on my sisters. I dont think the bulemia/anorexia is going to be a problem my sisters love to eat way too much (they are chunky). But I dont want the boy thing to rub off, I dont need my sisters pregnant before I am. Jen is literally about a size 2 and thinks she fat, looks to weigh about 80-100lbs and about 5'7''. She wears her makeup like a hooker and doesnt dress most of the time much better. Unless she is with my family, then she a wholesome child besides the makeup. Ive heard some of the conversations Jen has had with her bf on the phone while at my house, and its stuff that 16 year olds shouldnt be even considering, like sex, explicit moves etc.. My parents and I have talked about it a little. But they think that since Jen is one of my sisters only friends they dont want to stop them from being friends becuase it would crush my sisters. I dont know if my sisters see the patterns in Jen like the bulemia, but I know they see the boy stuff. My parents have always been in it, around it, and all up in our lives since we have been on this planet. But this is starting to bother me because I see have very slipperly slope for Jen. My dad is a recovered alcoholic/drug addict. Ive never seen my dad drink ever or take any drug stronger than ibprofen, unless otherwise perscribed by a doctor. My dad has tried to talk to Jen about having her Dad talk to my dad about his habit. But to no avail as of yet. My family and Jen's "family" are of the same faith. My sisters have taken Jen to our church and they had a great time. Jen used it as flirt and pass around my cell number time, but still paid attention to what was being said I think. But I can see the vacancy in Jen's eyes. I dont know what to do about her, because not only is Jen's life at stake but my sisters and Jen's Dad. My parents have laid down ground rules for when Jen is at my house. But if anything I know Jen respects my parents, and if she crosses the line my parents will tell her. More than likely becuase of the rules that have been set for her. Now I understand that girls can be boy crazy and hop for guy to guy, and that people fall on hard times. However, the future is not looking really bright for Jen, shes going to be lucky to graduate high school. My sisters want to be on a band scholarship to a major university and get an education. I dont want anything to mess that up, and Jen as much as I hate to see her like she is, is getting in the way. I just dont know what to do.