It's a very, very tricky situation. I'm afraid that it might be very difficult for you to put boundaries in place if you are living with your mother and stepfather. There is not only the dynamic between you and your mother but between your mother and your stepfather. Is the hospital fully aware of the latter?
It's even more difficult if the PWD is able to manage his/her own personal care, is mobile and is generally healthy i.e. when the problems are largely behavioural. I assume that this is the situation with your mother and is why the hospital thinks that she's not ready for a care home. Really, your mother and stepfather should probably live apart but there appears to be nowhere for him to go. There is a conflict of interest here in that if he moved out and your mother moved into a care home you might have to leave your mother's house so that it could be sold to pay for her care.
I think that I would push for your mother to stay in hospital or an assessment unit for quite a while longer to see if her symptoms can be brought under control. If she's discharged home prematurely it's quite likely that there will be another incident before long and you will be back at square one.
Thanks for your reply, that's what worries me the most, another incident. It worries my brother too, but we just don't know what to do. I don't think my step-sister or step-dad have thought through things - I know separating them in the same house isn't ideal (he currently has a lock but forgets to use it) but nothing about the situation is easy and I'm the one who's ultimately going to have to deal with them, not her.
There are some pretty unhealthy dynamics between mum and my stepdad over things that have never been resolved. Before the dementia got bad, mum came very close to divorcing him several times (in lockdown) but always backed out at the last moment.
With my mum she's sort of in between - she struggles to do things - for example, she has to sit down or lean against a wall to dress etc. She can't walk far and very little balance. She also wasn't washing etc at home. She's chronically exhausted and there's a lot of apathy so it's hard to know what she can do and what she doesn't want to do. Before the hospital it was very difficult to get her to engage in anything. She refused to see friends or go to support groups, has no hobbies any more etc. I wonder if she plays up a bit for me unconsciously because she *is* apparently doing most of those in the hospital (covid isn't helping her eat etc though). It's been a real struggle to try to get her to eat etc. Maybe it's because I'm her child not a nurse?
I'm hoping they do keep her in for a while longer, and I feel terrible about that. I don't want to put her in care home (I know there are lots of good ones but I feel like I'd be betraying her) at least not yet. So we're stuck. My phone calls with her are stressful. She's almost always angry with my stepdad (her delusions are ongoing) or upset and always desperate to come home. I don't know what to say. I feel horrible about her being there, but right now I think she needs to be there. I just wish I didn't feel like a failure.
I worry about her coming home. It's difficult to get her to engage in virtually anything (apathy and exhaustion) but I'm going to try to seek out some dementia friendly things when she's back.