Yes, did you see the original or the follow up?

In the original it was the daughter who had schizophrenia and it was the parents hope that the younger son would help care for her once they were gone (later in life).

In the follow up show, the son was diagnosed with schizophrenia as well. His was even more severe than his sisters, and by that time the girl was very much improved and going to public school.

The father/husband ended up seeing another woman I believe and the parents are now divorced.