This is the family of Friend William Curtis, and his wife, Nellie Christena Hansen. Friend William was the son of Friend Charles Curtis and Mary Catherine Burrell.
Friend and Nellie's children were, from oldest to youngest, Benjamin William (Bennie) , Donald Keith, Dean Hansen, Imogene, Leo Charles, and Maribelle.
This picture was not labeled, so I'm not sure which of the 2 boys, that are about the same size, is Donald, and which is Dean. The rest seem obvious, based on birth order.