Since Roy's case happens to combine my interests in genealogical research, Washington state history, and fraudsters - I've been working more on it. Here's what I've come up with:
Roy's past lineage claims all have to do with his paternal grandfather William Ray Wilson (1876 - 1942). Claim is that William Ray was actually the son or grandson of a Cowlitz woman and a French Canadian man, and that he was given to a white man Benjamin Wilson to foster.
1880 federal census Whitman, Washington lists 4 yr old William R with his father Benjamin P Wilson, both white.
In 1895 William Ray Wilson married Clara E Hodges in Whitman, Washington. His parents are listed as B P Wilson and Parthena Fay. Everyone white.
http://www.digitalarchives.wa.gov/DigitalObject/View/1739F62FDA0BB177C19EDC56337B6F56(His mother Parthena Fay Wilson had died earlier in 1880, before the 1880 census was taken.)
From about 1912 - 1932 William Ray Wilson, wife, and children (including Roy I Wilson's father Roy Edward Wilson) are on Indian Census Rolls, Yakama. He is listed as Indian on his war draft registration too during that time. In 1932 William, his wife, and two children are each listed as 1/4 in the degree of blood census section.
Reservation agents made the decisions as to who would be on the census rolls. Indian census rolls were often used as a basis for property rights. About 1930 census rules changed, much more information on each person was then collected.
http://www.archives.gov/research/census/native-americans/1885-1940.htmlThat region was going through a huge population boom, like a gold rush boom town. In this case it was a "fruit rush", all about the irrigated high production fruit orchards. Railroads, and vastly expanded irrigation of farm land meant there was a lot of work to be had and money to be made.
Before and after that time the Wilsons were identified as white.
So Roy's past lineage claims could be true, or false. He's also said that he is not NDN at all, but he still uses the bio:
I was born with an Indian father and a non-Indian mother. I have Cowlitz blood, Chinook blood, Yakama blood and Iroquois blood.
http://www.turtleislandstorytellers.net/tis_washington/transcript_r_wilson.htm