Eilts family picture
The older man sitting down is Tjark Eilts and his wife Imke Cordsen
Eilts is sitting beside him. The tall man in the back is John Jacob Eilts. The remaining
people have been identified by Heinz Janssen from Wittmund, Germany who is a distant relative.
They were Katherine, Jacob Edgar (the young man in the middle), Irena Adalaide "Rena", Wilhelmina Edzardina and Anna Tjamde Eilts (but don't know which girl is who on the photo).
Two other children of this couple died before. See also here: https://de.findagrave.com/memorial/12776999/tjark-h_-eilts for more information on the family.
The picture is believed to have been taken in Minonk.