If you are unable to assist, hire help.
If there is a lack of $$, see the good folks at your State's Department of Elderly Affairs. Don't forget to speak to the doc as he might have resources once he understands your family's needs.
What is your Mom being treated for? Some folks, assuming it is affordable, benefit from assisted living. Some insurance plans include long term health care. It sounds like you may also need an estate planner for their needs.
Dunno. you need local and professional assistance.
Very good luck.