You know...Im going through the same type of search for my Dad's fathers maternal side. I have my great grandmother's parents down as Olaf Benson, and Pearl Bray...I know Olaf was definitely from sweden, but I cannot find anything about him or his wife. Its been a rough ride, but I am glad to see that we share a similar ancestry. My great grandmother Elma Viola Grace Benson was born in Kimball, NE in 1900, and ended up in San Francisco..thats all i really know. Anyways..good luck in your search.
Chris Williams