How to preserve assets for senior who, suddenly, can no longer live alone?

My uncle, who is 89, was very active until last week, and we was sharp as a tack as well. He has his own apartment and was living by himself. He was feeling bad and went to the hospital. His condition worsened, and we've been told he had an aortic dissection. Now he is in the ICU and is struggling to say simple sentences, and no one is sure exactly why; he hasn't had a stroke, according to the CT scan. It's possible that he is having a reaction to some medications but all we have are guesses. We've been told he will never live alone again and that he will need to go to a rehab facility if he makes it through this hospital stay. After the rehab facility would come assisted living.

My uncle's family is ill-equipped to deal with his problems. He has a wife who has dementia and has been in an assisted living facility for years. He has only one child, a grown daughter who feels very uncomfortable taking care of financial matters, including selling his apartment. She has indicated that she is over her head and doesn't feel she can handle all of the responsibilities.

My uncle has some assets, and I am concerned that if he survives and ends up in a facility, those assets will all go to his care. I do not think he set up anything in case of his own need for long-term care. Is there anything that can be done to prevent a situation that may leave nothing for his daughter? Thanks for thoughts and recommendations on a course of action.