Evelyn Elizabeth Twidwell

My biological grandmother on my father's side was Evelyn Elizabeth TWIDWELL b. 08 Jan 1908 LaGrande, Union, Oregon and d. 18 Aug 1993 Deer Park, Spokane, Washington. She was married first to Lester Edward ROBERTSON b. 17 May 1903 Sumpter, Baker, Oregon d. 17 May 1994 White Salmon, Klickitat, Washington. My biological father was Stanley Edward ROBERTSON b. 11 Apr 1928 Spokane, Spokane, Washington d. 24 Jul 1991 Spokane, Spokane, Washington. Any information I could get on this family would be helpful.
Dena (ROBERTSON) RIDER