Mietje van Polen was a daughter of Isak van Polen and Sara Wijsenbek. She was born on 3 December 1875 in Culemborg and was the youngest of eight children. On 18 May 1899, she married in Amsterdam the diamond cutter Joseph Ephraim Lemans, a son of Liepman Joseph Lemans and Kitty Abrahams. Joseph was born in Amsterdam on 13 December 1874.
The Lemans-van Polen couple had four children, namely: Kitty …