Melissa & Hester Larsen stand behind Bobby & Mary Jo Trezise. Hester is mother to Melissa, grandmother to Bobby & Mary Jo. The house behind them appears to be the Larsen family ranch home.
"Mother, Daisy, and Virginia Green" (Caption from photo album)
Hester Larsen holds Daisy the horse with Virginia Green is in the saddle. There is a fenceline behind them with a house and trees in the background. Virginia is holding onto rope and the saddle horn.