Problems with parent getting old and sibling arguments. Any advice?

Hello,
This topic covers more than Burnout, but I filed it under burnout. Can anyone else relate to looking after an elderly parent and having problems with adult siblings?

Covid19 - caused issues, I was asking a family members to be careful and no visit the house during covid19 lockdowns, but they still came. People were asked not to visit elderly relatives that were more vulnerable. Instead, I was accused of being controlling. Currently there were no vaccines available. There were massive arguments, shouting, use of expletives directed at me, by one of my siblings.
My sister who visited my mother’s house regardless of Covid19 restrictions and top of it not following any of the precautions, she pretty much went about life as if there was no pandemic around my mother as well, this caused many arguments, My sister was not working because of Covid19 restrictions for a whole 2 years almost, I said, you should stay and help out with our elderly mother instead of going back and forth and increasing the chances of my mother getting the virus.
Instead, she decided to manipulate the situation and told my other brothers & sisters, that I was shouting and causing arguments, not letting her some to the house, so they started to gang up on me as well. This was happening while I was caring for my mother long before covid19 started and looking after all her mail, appointments, household, and general well-being. Needless to say, the situation got worse with my brothers getting involved. My sister manipulated the story at a time during peak covid19, having an elderly mother who is high up on the vulnerability list, and at the time there was no vaccines available; and she turned this into me being controlling and argumentative. She did not stop with just telling my brothers, she started telling everyone she spoke to get sympathy.
At the time I informed my sister after our mother had her vaccines, my mother would be able to get out more and do more things and be a lot safer. I was trying to stay by the advice especially for elderly people and protect my mother until a time she was fully vaccinated. All my siblings sided with her story for some illogical reason, other siblings are pretty much like back seat drivers as far as looking after my mother; and they could not see I was doing the right thing for my mother at this time when people were unsure, unclear, just how bad the virus was.
Today we know it was bad especially to the elderly generation. The relationship with all my siblings is now tarnished, I think for good, with the way they reacted to a very dangerous situation for my mother, with how my sister used other siblings to side with her and then gang up on me, and then with things said to me. I was on talking terms with my brothers before she spoke with them.
There was already some history with one of my brothers, and my sister knew that he would just be looking for any excuse start more trouble, she told her own version of the story, of why I was asking all people not to visit, this was government law too, not just me making it all up. Giving her incorrect version of events. I was asking her to either stay permanently or not making periodic visits during the covid19 peak period.
Outside of this. I am one of 6 siblings and over the last 5 years and long times in-between working, I stay with my mother after our father passed away. I did this because loneliness is terrible. The other 5 siblings just get on with their own lives, with occasional visits or occasional phone calls, they don't see the problem my mother has day to day, what she must suffer, all the help I provide. They think just by visiting her occasionally they have done a great service and help. The phone calls are once a month or more and some visit once a year if that.

After all I have done to help, protect my mother after my father, I am simply fed up, stressed.

Thank you to anyone that read this.