Go to the web sites of either the Ohio Historical Society or the Ohio Dept of Health to see which has the 1956 records and get a death certificate. That should tell you a few things. Ohio,like a lot of states, has shut down a lot of it's mental hopitals and the availabilty of all the records is not easy to determine. Some of that stuff is in the Ohio Historical Society but they don't seem to have accurate indexes of what is included. The two biggest mental hospitals around cleveland were the Warrensville Hospital and the Turney Road Hospital. Both have been leveled decades ago. There is one that still exists in Sagamore Hills.