| His parents | Married 1819 | Her parents |
4GGF Johann Quirin Gerhartz |  Germany -> WI | 4GGM Gertrude Gerhartz |
| Ancestor 116 (1110100) 1797 - 8/29/1867 | Ancestor 117 (1110101) 1799 - 1859 |
Johann and Gertrude started their family in Buschmühle, Germany, where Gertrude had grown up. They had at least two German-born children: Johann Arnold (1819) and Peter * (1836). With such a gap in between, there were likely other children that I am not aware of.
They migrated to the US between 1836 and 1839, settling in Marshfield (presently Mt. Calvary), Fond du Lac County, WI. They had at least one American-born child, Gertrude (1839).
Neither Johann nor Gertrude appears on FindAGrave. I have not yet seen their death records. As with 4GGP Brust, their likeliest burial ground would be St. Isidore Cemetery. Lori L. at St. Isidore told me that she does not have Johann Q. or Gertrude’s names on record, but that their son J. Arnold is there. Here is Arnold’s FindAGrave profile.