Garth, with bottle, watches as Mary feeds a bum lamb with a bottle. Circa 1921. I'm not positive but it looks like they are Grandma Almira Duke Harrison's house in Naples, Utah.
Second picture shows Garth and Mary. Baby boys wore dress attire for couple years. I can see some benefits to that method. Mary is 18 months older than Garth. Circa 1922
This last picture is Garth, Mary and their Uncle Heber. Heber is the 10th child of Richard George and Almira Duke Harrison. Born in Sep 1913 he was only 6 years older than Mary. Almira Duke would have been 47 years old when Heber was born. Heber is Mary and Garth's mother, Inez's brother. Inez was the oldest sibling and Heber was the youngest.