Ultimatum for sibling

Has anyone else had to give their adult sibling an ultimatum? My 48 yo sister refuses to take her meds. She has schizophrenia, bi polar and depression. She lives with our elderly parents until last week when she got physical with my mother and threatened to kill her. This all takes a huge tole on my mental health and I just don’t think I can keep taking her panicked texts, calls and listening to her stories. She is extremely paranoid. She needs help but there’s no rooms in the crisis centres here and the police won’t do anything. They’ve been called at least twice a week for a year.

I’m sorry you are going through this right now I’m also a sibling ,
Is your sister currently homeless then ?
My sibling has been in and out of but mostly in psychosis the last 6 yrs and there were many time my Dad felt in danger .
I understand about sometimes the police can do nothing .
A suggestion would be to find out who the county crisis team is contact them give her back history.
They will be a resource for her and your parents.
If she wants willing to be inpatient
start calling all behavioral units.
There is the option of getting her a case manager through social services if she is willing .
What about your parents are they going to have her back home. If so what resources do they need ?
If you or parents have never attended a Nami.org family support group or family to family course this would be helpful.
An ultimatum I have thought about it many times sure, but have realized for me its more about my own personal boundaries with my sibling and focusing on what’s in my control. Rather then forcing things because that never worked in my case .
And therapy for you if you don’t already . this disease not only affects our loved one but us as well .