And you have exhausted all your resources??
Called the Library in Youngstown,Mahoning county and checked what there resources such as newspapers, obits, deaths, etc... And genealogy websites and volunteers that know about the area.
County Library probably has email you could write too.
DId you check newspapers in that area.
If there was a flood that people died in I would imagine it would have made news.
Have you checked Ohio deaths for 3 people that died on the same day. Findagrave?
Have you checked birth for William of September 5th 1908 and his twin brother
i see he doesnt mention being Indian on any of the census records.
But if he was, there def. should be some documentation in Youngstown ohio.
I also see that William's adopted mother was also born in Ohio, that makes me think maybe she was realted or knew the family. Otherwise it would make you wonder how he got all the way to Michigan in that day.
Have you tried looking into last names Leasure to see if it was an known Indian Surname?
Have you looked into floods of Ohio that would have been between 1908-1920?
These are the things i do when I research, have to dig.
I do know there was a destructive flood in Ohio March 25, 1913.