I recently started to search the Harteau name and saw your post. Sam Harteau, my grandfather, was John Henry's son.
His daughter, my mother, was adopted (not formally) and they didn't tell of her background. Sam died in 1940 in St. Paul, MN. After John Hebnry's first wife, Celia Vincent, died her parents used to vist him and his second wife who was an Indian women on the Bad River Indian Reservation. If you have info please let me know. We would appreciate it. Thank you.
Please e-mail me. firstname.lastname@example.org