Etta Margretha Rüstmann, daughter of Johann Heien Rüstmann and Trienke Claassen , was born on 6 March, 1843, in Folsenhausen, Ostfriesland.

Etta Margaretha married Dirk Janssen Alcken in 1865, in Nord Dunum, Dunum, Ostfriesland. Dirk was born on 15 May, 1834, in Tettens, Jeverland, Oldenburg, Germany. They had one child: Hinrich Janssen .

Hinrich Janssen Alcken was born on 12 November, 1865, in West Dunum, Dunum, Ostfriesland.