It looks as if Emma and her children are enjoying a backyard production.
Emma sits at the right shielding Harold's eyes from the sun light.
Mary, in a pompadour hairdo, is seated next to Hazel who looking to the left
(away from the camera). They sit to the left of Harold's knee.
Marguerite is probably the child sitting second left of Hazel.
Sheets in the background serve as theater curtains.