My sister is living with parents and she is being awful to them

[Babybirdmum]

My sister is early 20s and has recently split up with her boyfriend who she was living with. She is back at my parents house and she has OCD and probably other mental health issues without a diagnosis. She is awake in the night screaming and swearing at my parents and threatening to kill herself. So far I’ve offered for her to stay with me, she won’t because she can’t be around babies due to her OCD and I have a baby. She doesn’t have a job either. She won’t take medications, the closed she’s come is getting them prescribed once. Ive bought her and my parents books about different problems to see if they would help but they don’t read themes. I sometimes give my parents advice but they seem to have their own ideas of how to do things. It’s making everyone very unhappy, how can you help someone who doesn’t want to be helped but desperately needs it or it might end with her suicide?

Handing out books to read is not going to work.
You DP are not going to be able to couch diagnose your DS. She will need help from individuals who specialise in mental health.

Your DS is clearly not feeling happy after her breakup and it can uproot and bring on all sorts of mental challenges. Not to mention having to move back to parents while life gets back on track.

It is difficult to see our loved ones go through these challenges but the best thing you can do is listen, if you can. Listen without having the need to fix things. Its unbelievable how much support one can get by being heard. And it will also create room for trust.

While she is able to stay at your DP, she may find some stability, comfort knowing they are around, and obviously your DP will need to set some boundaries. But your DS is an adult that has found herself in a bit of a pickle after a breakup, it can happen to all of us, and she is probably in a very dark place. But for someone who is suicidal they will be experiencing their loneliest time, feel shit about themselves and in no need to be told how much harm they are to others. Talking without reacting is the best thing you can do, and your parents. And obviously call the Dr office if things become so serious that is beyond your family's and yourself ability to handle.