This photo is from a mid-1970s Ross family reunion. Harold Whitted (husband of Helen (Ross) Whitted), Ward Gillespie, Mary (Ross) Gillespie and Mason Ross.Ward died in May 1978 and John Ross Jr., who died in March 1976, is absent from the photos. So I would date this photo as summer 1976 or 1977, but I would favor 1976 if forced to pick one. I believe this reunion took place in Lake View, Iowa. Mary, Helen and Mason are siblings of Clara (Ross) Fowlie.
The connection to the Brassfield surname is Clara's daughter married a Brassfield. These would be my great grand aunts and uncles.