Nursing Home and Power of Attorney?

A friend's wife was in the hospital and is now in a nursing home. Medicare will no longer pay for her care and the nursing home wants to attach her income and assets. Her husband wants to take her home and set up care for her there. The nursing home is telling him he can not remove her from the nursing home unless he has a power of attorney. They are pressuring him to sign documents giving them rights to her assets and property. They own a home together and he is concerned that he will lose the roof over his head if his wife passes and is refusing to sign any of their documents stating they take control over his home and assets.