Gretke Maria Rustmann, daughter of Foke Janssen Rustmann and Lucea Maria Antons , was born in 1829, in Moorweg, Esens, Ostfriesland, and died on 2 March, 1907, in Werdum, Ostfriesland, at age 78.

Gretke Maria married Edo Gralfs Hieronymus on 4 May, 1852, in Nord Dunum, Dunum, Ostfriesland, Germany. Edo was born in 1827 in Klein Charlottengroden, Carolinensiel, Ostfriesland and died on 6 April, 1887, in Nord Dunum, Dunum, Ostfriesland, at age 60. They had one child: Inse .

Inse Hieronymus was born in 1853, in Ostbense, Esens, Ostfriesland, and died in 1882, in Ostbense, Esens, Ostfriesland, at age 29.