Who is Margaret Patton from Hocus Pocus and what is their importance?

Margaret Patton is Eugene's wife. When Margaret first meets Eugene as a young woman, she fails to disclose to him her family's long, tragic history of mental illness. Later both she and her mother become insane and require long-term, in-home care, which Eugene is forced to provide. Margaret's form of mental illness basically makes her reclusive from society. She spends most of her time inside a dark home with the drapes drawn, fearful of contact with the outside world. She and her mother Mildred Patton feed on one another's insanity, cut off from reality and stranded together. Eugene still very much loves Margaret, or rather, the memory of the loving person she was before her mental illness permanently took her from him.