Care giving, for someone who is in that condition, is VERY VERY hard.
Your Mom is not young.
And if she continues to care for your Dad... in his state, what if one day she gets hurt?
Or gets a heart attack just from the stress and lack of sleep????
Or falls, while trying to care of your dad and do things for him?
Those things, can and do, happen.
AND you and your sibling, cannot help, your Mom.
So it is not for you to choose and impose on her, what to do.
I did care giving for my Dad, for about 3 years. Why?
Because, my Mom, COULD NOT, do it... by.... her....self.
In fact, my Dad, WAS able to tell me, and my Husband that we need to help, my Mom.
And we were already doing so.
Which meant, taking OFF of work, and toggling everyone's schedule... so that, SOMEONE could be home with him, at ALL times.
Care giving, is VERY VERY hard.
And, it is 24/7, day and night.
And OFTEN times, the Care Giver, does not even get sleep themselves, NOR do they even have... "me" time or anything.
THEY cannot even, go to needed appointments themselves etc.
They have, no break. At all.
Care Givers, have NO life.
It is, VERY arduous.
I feel, that it is very selfish of your sibling, to make your Mom, do it all by herself.
AND you and your sister, CANNOT provide the level of care that your Dad needs. NOR can your Mom.
It took, THREE people, to do care giving for my Dad.
Everyday.
Day and night.
24/7 seven days a week.
Can your Mom... continue to do that all by herself????
And you and your sister feel she is thinking of "her needs and not my fathers"?
Do you know... that one day, while my Mom was home with my Dad... she fell. Onto the concrete patio. And broke her wrist and other things.
Who then, would have cared for HER while she was caring for my Dad.... while she was laying on the ground????
She was a caregiver. With no medical background or training.
Good thing, me and my Husband, were also around.
So now: think, how it is for your Mom and what you and your sibling expect, of her....
And that, your Mom does it all by herself.
She is NOT selfish or thinking of herself.
Do you realize... how HARD it is, to care for someone in advanced Parkinson's stages???????
You and your sister, probably could not even do it, yourselves.
Your Mom, has been very brave, thus far, doing this.
You need to see that.
And your sister too.
Do you understand, how Parkinson's is?
And how a layperson who is not medically trained, will also endure lots of hardship... emotionally and physically and mentally. Daily.
And, your Dad is probably bigger and heavier, than your Mom.
How can she... handle him, daily? Per toileting and bathing and all the basic things that needs to be done, daily, night and day?
Plus, how can she, get adequate sleep and care for herself, too?
Don't you want.... your Mom, to be able to care for herself too?
She cannot do so, at this point.
Your Dad, is in advanced stages of Parkinson's.
What if she and her health, starts to degenerate, too?
OF course, any Care Giver, gets "short" with other people.
Because, it is VERY VERY VERY VERY VERY, stressful, doing care giving.
And, it is a very lonely... thing to do.
Care Givers, do not have a social life, outside of their constant care giving.
And, they can never, leave home alone, the person they are caring for.
Your Mom, is a shut-in, Care Giver.
You NEED to, understand.... being in her, shoes.
As I said, it took THREE people, to do care giving for my Dad.
And he was, in a facility at one point, as well.
But even while he was in a facility, we STILL spent a lot of time, going to see him etc.
But at least at that point, medical professionals, were caring for him.
Your Mom, is all ALONE in this.
Doing, everything.
And to expect her to continue doing so.... because your Dad worked hard all his life to provide for your Mom, is NOT a reason... for her to be suffering, as well, as a Care Giver.
Unless you do it yourself or your sister, you will not truly understand, what Care Giving, is and all that it entails. 24/7, day and night.
And all the stress, involved.
Your Mom, is NOT... thinking of only herself.
She needs, help.
And lots of respite.
You said yourself, that "neither my sister or myself can provide the level of care that he needs."
So, how can your Mom, do so, and be expected, to do so? With your Dad who is in advanced stages of Parkinson's?
And sure, being a woman, with 'strangers' in the house, caring for your Dad... well, that can be, unnerving.
How can she defend herself, should something happen?
**ETA:
You AND your sister... NEED TO take care of your Mom, TOO.
Not be, bystanders.
Your Mom, needs care taking, too.
Let your sister, read all of these, responses. SHOW the responses to her.
And if she will not agree to have your Dad in an assisted living facility, then she better move in with your Mom, and help your Mom, herself.
And DO, something.
And just think: HOW... can your Mom, all by herself, even take your Dad... to his Doctor appointments???? How can a woman, who is probably smaller than her Husband, get... her Husband who has advanced Parkinson's... into... the car, and go to an appointment?
And HOW can she, even go, and run errands for daily living... while he is at home alone???
And that is just, some of the very few daily details, that your Mom, must contend, with.
As you said, your Dad "...has advanced Parkinson's. He is to the point where is often confused and has a very hard time communicating. Walking is a challenge and in the mornings he is often incontinent. He can no longer bathe or groom himself, or be left alone...."
If that were my Mom, I would be helping her.
Your Mom, probably already feels "guilty" for needing help.
That is a Care Giver's, life.
I know.
I lived it.
My Mom, was in her 60's, when we ALL went through this. And we ALL had to help, DAILY, with my Dad. And as he was degenerating further. AND when he had had a stroke and other things.
OF COURSE, your Mom, is mentally suffering.
This is, common sense.
NO spouse, can do all of that, by themselves.
A Wife, WILL suffer mentally and emotionally... from this. When their Spouse is falling apart.... physically and medically and emotionally.
That is common sense.
You both need to see.... this.
And realize, HOW your Mom, has been VERY BRAVE... all.... this.... time......
DO you want... your Mom... to degenerate, too?
You and your sister, need to, intrinsically.... think of her.
And, your Dad, will not get better.
It will get worse.
You all, need to realize that.
I know someone who's spouse had Parkinson's.
And her Husband, was a big burly sized man.
She could not, even assist him when he couldn't walk. Or when he couldn't control his reflexes. Or when he could not control anything he said or thought and was mentally confused.
You and your sister, have to get that, understood.
Your Mom, ALREADY... said... what she needs and cannot do.
So waiting for "if/when the time comes to help her find the right place for my Dad...." has arrived, already.
Your Mom, has already... said, she needs help. And with the decision.
And she is probably at her wits end.
Look after, your Mom, too.
She is in a very, hard place.
Emotionally.
And physically.
Your Mom, has already.... asked you and your Sister, for help.
If you both don't want your Dad in a facility, then one of you move in with your Mom, and do it and help, her.
So that, medical Aides can be there too.
And bear in mind, that having medical Aides in the house, does NOT mean, your Mom is thus living her life free and easy with no worries.
Because, it is heartbreaking, to go through this.
It is not perfunctory at all.
Have you or your sister... spent time... with your Mom in her home, ALSO caring for your Dad? Daily?
Have you seen with your own eyes, and felt it, what it feels like... to do so, with your own eyes and doing it, yourselves?
Why don't you both... go and visit your Mom, and stay awhile, and DO, what she... is doing. Daily. Night and day, FOR your Dad.