A religion family member 67 years old with depression, how to help?

She has difficulty in remembering things especial if she takes medicine.

If her sons go out of the house, she cray, she gets anxieties, has problem with concentration and depression.

She got a lady to be with her some times, but after she go, she ask her son to come home.

All doctors tell that she has depression.

She don't want to move to a retirement home and her son want her to live at home, he want her to be healthy and he has to go to work.

Do you know what kind of medicine can help and what will you do next?

Thanks.