Coping with sick but stubborn mother and sibling issues

I just got off the phone with my brother, Dave and I was thinking, who can I talk to?  Then I was surfing 2 peas and I thought, the peas might help me sort things out.  Lord knows there is plenty of experience here with similar issues.  If you can hang into my story I am open to your ideas and feedback.

My mother is 85.  She lives independently 5 hours away from me.  She has 4 children.  I am the oldest and have her power of attorney and will be her executor.  My youngest sister cut herself off fro my mom so although she is just an hour away she does not exist for this issue.  The next sibling is my brother, Bob who is in such poor health from COPD he might not live out the year.  He is nuts anyway, a raging conservative who will cuss a person out in a heartbeat if they have college, a profession or liberal thoughts.  He lives an hour away from my mom also but basically cannot help out because of his own health.  He can run his mouth though.

There is my other brother, Dave,who has been in and out of prison his entire life, primarily alcohol offenses but has managed to stay out for almost 5 years now. He still drinks and still drives without a license. He lived with my mom until last summer when he and his fiancee bought a house.  It is not handicapped accessible in any possible way.  It is about 15 minutes from my mom's rental home and his job is less than a minute away from her as well.  He has always been her favorite and she has relied on him to stay in this home in terms of maintenance/yard work, etc.

Then there is me.  I am retired.  I also worked as a hospital social worker for 30 years.  My mother and I have been close and before this quarantine I visited her about every other month.  My mother is very very stubborn, outspoken, and loves her privacy and living alone.
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My mom had a knee replacement about 10 years ago and never had the other one done.  She can hardly walk and has put on a lot of abdominal weight.  This puts incredible stress on her already terrible knees.  Subsequently she has been falling.  She has 2 sets of stairs in her home that is a rental.  She refused to see an ortho doc to see what could be done for her knees to give her mobility.  

This past weekend she fell again.  This time the bone holding her knee replacement was fractured.  She ended up getting admitted to the hospital.  My brother Dave who lives nearby has been handling everything, and has been calling me up telling me he is emotionally stressed and can't handle all this.  I told him I am coming up as soon as she is discharged.  He is angry that I have the power of attorney and I haven't said one word to him about the fact he is the one talking to the staff and doctors.  He's right there so all that matters is that she gets what she needs.

She fell again in the hospital getting up to use the bathroom.  She won't listen to them.  Dave calls me up and he's all upset that she won't listen.  He said she cannot go home but he won't allow her to go into 'a home.'  My mother has the financial resources to go whereever she wants and lives in the midst of all kinds of senior living options.  The plan has always been that she will move near me when needed, but she told me she is not ready to move.

Dave is going on and on about getting an estimate to build onto his house for her.  He cannot afford it, he cant even pay his mortgage.  He is one police stop from going to jail again.  My mom does not care for his fiancee and would never live with her.  Then at the same time my brother is going on and on about his stress, and I told him why is he getting estimates about adding on to his house when she is not going there.  He starts yelling about he needs to do it and why do I have a power of attorney and what he's going to let her do and not do.  I think he had been drinking.

Several years ago when my mother was hospitalized I went up to take care of her and I ended up having to call the police because Dave came in and threatened me in a drunken rage.  I slept on the floor in my mom;s room to make sure he couldn't harm me.  Tonight I felt all that fear coming back because I could hear it in his voice that he wants to run the show and control everything.  What he cannot recognize is my mom is completely competent and she will do exactly what she wants to do and nothing else.

I am fully prepared to move her near me or even with me temporarily if need be.  My hope is that the ortho doc will tell her that both knees can be replaced and she can continue to live independently when she is healed.  I can stay with her during recovery.

So here's my worries:  What if she won't agree to anything feasible and insists on staying in her home?  What am I going to do to deal with my brother Dave because he is the one right there and he is used to being intimidating to be in control - he mastered that during his many prison stints.  Dave keeps saying we have to decide and tell her how it's going to be.  That is not my approach with my mom and it's never been the way to deal with her.  How long is it reasonable for me to stay with her until I get back to my own life because right now my mom doesn't even want me there at all.  She is in denial about her needs but I have hope that her medical staff can lay it out for her.  How can I successfully move my brother from his position of being the decision maker in light of the fact he keeps yelling about being too stressed to handle this and telling me I have to get up there.  I am already packed and ready to go as soon as I hear she will be discharged I will be on the road.  She can;t have any visitors which is why I haven't gone yet.

I don't know.  Does anyone have any thoughts or experiences to share?