Winona Keister Smith is in the front row with the light plaid dress and the bow in her hair.
Marie Keister Sartorius is in the back row, 2nd from the left with the two bows in her hair.
Their brother Levi could be the boy in the back row on the right end, but am not positive.

Front row - left to right: Russell Kuhnke, Fred Wolfle, Harold Fisher, Kenneth Schony, Avery Lentz, Russell Frankeberger,
Louise Raymer, Paul Fisher, LeRoy Lentz, Winona Keister (Smith), Russell Neisemeier, Clifford Wells, and Floyd Carl.
Middle row - L to R: Rowland Lentz, Marie Keister (Sartorius), Ralph Griffin, Melvin Lentz,
Cora Kuhnke (Remmers), Loy McCauley, Emma Schony.
Back row - L to R: Grace Kuhnke (Lapp), Blanche Griffin (Cramer), Ira Miller, teacher, Bessie Fehr (Davis),
*Waunetta/Wonnetta Keister (Keil), Verde Barker, and Levi Keister.