Leentje Plukker was a daughter of Meijer Simon Plukker and Hanna van Sisteren. She was the widow of Abraham van den Berg (who passed away in 1890) and Levie Gerritse (who passed away in 1924). She had at least ten children, among whom Izaak and the here mentioned Marianna.
Stadsarchief Amsterdam, archiefkaart Leentje Plukker