I have done the care-giving thing for a few people in my life.
Most people actually tend to become a prick to one degree or another.
Resentment, hatred, anger, depression, anxiety, fear and lots of other things afflict a person who is
dependent on others. Few people actually like having to rely on others for anything in their life.
Mind this isn't me handing her a get out of humanity card, I'm just explaining.
They are in a new place. Tell me, how many Friends and family come to visit her? Many? Some, Few... none?
If its few to none you got to take into account that her son is the only insurance she has that she is taken care of. Yes I know, logically one would expect she would sweeten up and keep him around with generous amounts of thanks. However emotionally manipulation and keeping a person hostage tends to work far better since treating people nicely rarely ends as well as it should.
Fear does interesting things to a person. And she has real reason to fear, one of her offspring have totally abandoned her, she is most likely the other is going to abandon her as well.
Since she is going to rehabilitation, I strongly suggest you tag along when he takes her to therapy, and once she is in the gym or whatever you and he talk to staff there and ask them where you all can go to find more services to lighten the load on him.
Yes there are government programs. If she is on disability/social security she may qualify for several programs which include visiting PT and nursing.
Furthermore, if she is on SSI/SSD then he can be paid via social security for being her caregiver (not caretaker - caregiver).
Other services like maid service, food programs and other assistance programs are out thee footed by the state depending on the person's income and their disability.
As her caregiver he is going to have to draw some strong lines and stick to his guns. He is going to have to learn how to say no and practice 'tough love'. This doesn't mean beat or abuse her, but patiently and steadily make it clear that she cannot and will not hold him emotionally hostage.
I note that several of the individuals I cared for actually needed the threat of nursing home or institutionalization to motivate them - motivate them to do their exercises, motivate them to take on duties for themselves, motivate them to be a nicer (more grateful) person. The best method to remind them of that is tell them point blank 'If I wasn't here then what do you think will happen to you?'.
Its best said gently with no real reproach nor accusation in ones voice.
He is young and naive. Also he is emotionally invested - this is Mom for christsake - no one can actually turn on their own mother. no matter how much of a psychopath she may be.
I suggest YOU start googling and researching.
https://www.google.com/?gws_rd=ssl#q=ass...caregivers
http://www.dhs.state.mn.us/main/idcplg?I...=id_020554 is an example of what Minnesota can do. I don't know what state you are in, but you can Google Programs for people needing at home care in _______________(your state).
Her doctor will most likely have a list to start on. Social Security/State Disability will have pamphlets. Public health agencies have programs and pamplets. Churches often have programs of assistance....
The leg work is the killer. Even with the internet you will find that going to places and asking people directly tends to get more information than web searches.
Another thing is to Google Visiting nurse association by your state. as example:
https://www.google.com/?gws_rd=ssl#q=Vis...te&spell=1 While they may or may not be able to provide service, they tend to have a whole lot of useful information, pamphlets contacts.