I am also trying to find information on Cleveland Yowell. Helen was my grandmother. I did find out that he also went by Fisher Yowell. He married Mary Bonner who is from Donegal, Ireland. I believe that his father was Stewart G. Yowell who was married twice (his first wife died young). He had quite a few children. I think that Fisher Cleveland was from his second wife (both wives were named Mary)
I know this post is almost 5 years old, but figured I would try to respond in case you were lucky in your search.
Hope this helps. I'd love to trade secrets! Anne Marie