At the top: the woman holding one of the boys is Aunt Lanie. Her full name is Delaney (Almy) Wiltse. Those are her two sons in front of her, Ivan and Walt. Erma Almy is in the glasses and next to her are her sisters, Arlene with Margaret, and the two boys are her brothers, Kenneth and Cliff.
The boards in the back are supposedly a blocked up tunnel that goes through whatever mountain they are on in California in 1921.