I am the gg-grand-daughter of Carl Theodore Buttke, who accompanied his niece Justine Buttke (your Justine) and her family to America as a young man. William Seehafer did not come over to America at the same time as Justine (she was a very small child when she came over--per her diary). Most of the Seehafers came over in the next decade. I have not been able to fit William Seehafer into the mix yet. He may be a sibling of Christian & Simon Daniel John Seehafer, with a third likely brother, Johan August, and 4 other unnamed brothers and a sister. These would be children of Christian Seehafer & Euphrosin (Eva Rosine) Redmar/Redman.