UPDATE:
I spoke to my grandfather for the 1st time last night. My sister in law is a genealogist and tracked down his syblings via the 1930 census. Then she checked the Social Security Death Index and found out his older brother died last year and found the name of his widow and her phone number. I called her and an hour later he called me. Turns out he lives in ID and not OR. We talked for over an hour and I must it was one of the best and most meaningful converstations of my life.