Well, I don't think this fully answers the question between Sam & Oscar, but my great-grandfather, William Addis (married to Elizabeth Matthews) had many children, one of whom was named Oscar (probable date of birth, 1890s or early 1900s), who according to my grandfather's obituary was still living in Brownsville in 1972. My grandfather, Howard, was born in Grindstone in 1903, which seems to be where many of that branch remained. Supposedly many of that side of the family are buried in Brownsville, near Nemacolin Castle. Some of William's other children were William, Vera, Mildred and Walter and one nicknamed Jumbo. There are supposed 12 in all. I will try Al's suggestion and contact John Addis in Oregon.
Is it possible that Sam Addis, Oscar Addis & William were brothers?Be cool to know.