Here's my best guess at who's who in this photo. Let me know if I goofed!
Standing in front: Steve, Lyle, Leslie, Hal, Delia, Lana.
Seated: Grandpa Neils Anderson, Grandma Mary Anderson
Standing 2nd row back: Evelyn holding Robert, Janice, Mary Karen, don't know who is behind Mary Karen, Deloy, Sylvia between Grandpa and Grandma.
Standing on the back: Kelvin, Kurt, Sharlene, Arvella, Brent, don't know who's next, Neils, can't tell who's the last one.
(Norman, Mary Joyce, Clair, Darold, Dale are the possibilities for the missing)