I had an aunt with schizophrenia, but at the time I was just a kid and had no idea what was wrong with her - I just knew that something wasn't right. She lived in an institution and would get occasional weekend visits to her sister (they were both old maids), and I can remember my Dad having to drive her back "home" on Sunday nights. It was something that wasn't talked about around us kids, and it wasn't until I was older that I knew what was going on. Back then (in the 50's), they didn't have the meds that are available now, and it was pretty much keep them heavily sedated, or just let them be, as long as they weren't a threat to anyone.
Hopefully with the progress that has been made over the years and the meds and treatments now available, that your Dad will regain some sort of normalcy and perhaps even be able to return home at some time in the future. My prayers go out to him and all of the family. Hang in there, Gayle.