I think your William Arthur Hinkley is my dad's father. I have he was born July 28, 19911 in Riggins, ID and died June 9, 1989 in Boise, ID. From what I know, he was first married to a Phyllis M Clark in 1939 in New Meadows, Adams, Idaho and had four children. I am told she died in a fire. He then married a Shirley Kluckhohn and they had six children. I'm connected through his second marriage. My dad doesn't really know anything else, but I have William's father listed as a Basil Hinkley and his mother as Janet or Jeannette Arbuckle, but I have no idea if that information is correct. Hope its helpful. If you know anything else I'd appreciate it if you could let me know because I'm looking for more information too.