Postcard of the Sonnemann clan, 1917 (?)

My mother wrote a note with her best guesses about who is who on this picture; see the next scan in this album. Unfortunately, I don't think they were all correct, as the relative ages don't match up. Assuming that the children shown in the photo all belong to the parents shown, it seems like the photo was probably taken in 1917 and that the people were as follows.
Back row: Nora Steinacker Sonnemann and Theodore E. Sonnemann, Emilie Sonnemann Krueger and Henry Krueger, Otillie (Tillie) Schuenke Sonnemann and Henry Sonnemann.
Sitting on bench: Alford T. Krueger (age 10), Johanna Buending Sonnemann, Theodore W. Sonnemann (baby), Mary Schaller Steinacker Beck Yauman (Nora's mother).
Sitting below: Anita E. Krueger (age 13), Lucile E. Sonnemann (age 4).