It is good to hear from an Eilerman, there aren't many.My wife is the Eilerman, I am the researcher.I show the following line which seems to be your anc. Frank Eilermann m. Lizette Nesbit Henry Eilermann m. Elizabeth ? Harold Eilermann m. Margareth ? Harold and Margareth's oldest son was Harry, Jr. b. about 1905.
I have quite a bit of data on Eilermann's in St.L.Let me have birthdates and the names of their wives and I should be able to piece together more info.
My email address is email@example.com. My wife's line is Frank Eilermann m. Lizette Nesbit August Eilermann m. Mary Johanntosettel Laura Eilerman m. Richard Howard Marie Howard m. Carl Sandau Sonia Sandau m. David Cox
Hope this helps, let me know more details on your Harolds and I can come up with more background.