Should Dad's live-in caregiver/tenant be allowed to bring people over?

First of all, no one comes until everyone has shots. Second, if she is a live in, I assume she has some "off" non-working time. Depending on who and what is going on, I might consider allowing her to have visitors during that time in her premises - not the whole house. If you go for this, I would work out some satisfactory rules that would work for both you and the caretaker, ie. no overnights, no parties or drinking, etc. Use common sense if it is "off" time - or you may lose her.

When you are a caregiver and especially when you are getting paid for it whether through an agency, insurance or privately, NO ONE IS ALLOWED TO VISIT YOU.

If this caregiver is really pushing to have others over to visit no matter who they are, then you need to decrease her hours so she can have the "needed" time off to be available for them or... she needs to quit this job. She has to decide how important it is to be "with them" and her job as caregiver. Sounds like she wants to kill 2 birds with one stone and this is NOT acceptable.

When others are around, she will not have her attention on your needs? Now... another option is this.... I don't recommend it -----try it and see how she is. She is there to be there for you (and being paid for this) while wanting to give/get attention from others? You might do this but lower her wages. She probably won't like that but.... less attention to you, less wages.

I think you are perfectly reasonable, but a she seems incapable of being without friends or partner even when she is working goodness knows what she is doing when she is not at work. Personally if it were my parent she would have to go. I would ask the other caregiver if she can recommend anyone, and the sooner you find someone else who does care and understand their responsibilities to those they care for the better. She does know she is being paid to work not entertain does she - absolute cheek - out the door with her.

Sunbrooke, this is not your original post about the caregiver situation with your father.
I remember your original post about it because I commented on it.
In the original post you were upset because the live-in caregiver goes out or sees people when the other caregiver is on duty with your father. You also did not mention her having company or her partner over when it is her work time.
She lives in the house which means it is her home. In your original post you expected her to be prohibited from seeing her partner and other people even if she is careful about Covid safety precautions.
Nearly everyone who commented on your original post agreed that she has to be vaccinated against Covid, and that you really have no right to order an adult to see no one and go nowhere.
I believe it was also explained well enough to you that we no longer have slavery or indentured servitude so you can't expect or command that your "loved one's" care be the sole purpose why a caregiver lives.
You should count yourself lucky that the caregiver stays and is only sending you emails in protest. If I was working for someone who made such demands of me I would leave that job without warning or explanation. The caregiver only owes for the services they are paid for. They do not owe you or your father anything else.

No one should be there except the caregiver. she has a job to do and if not 24/7, she can see her friends when she is off work.

I would say "NO"......and since you said they are not there 24/7......then they should schedule to have their friends/partner visit them when they are NOT with your father. how rude to invite others into someone else's house. you have no idea who they are, are they snooping around, taking stuff or whatever. Even if they or your father is vaccinated......no way to visitors to come into your fathers house unless he knows them personally. just my opinion and wishing you luck.

caregiver and guest(s) should have proof of vaccine before coming into house if they are able to get them yet.