Leentje van Geldere was a daughter of Salomon van Geldere and Sophia Polak; she was born in Rotterdam on 13 December 1867 and lived at home with her parents. Of this family, she was the seventh of the thirteen children in this family. Leentje remained unmarried.
She lived with her parents and sibs at Kipstraat 64, at Goudsesingel 118 and at Hoogstraat 156a in Rotterdam, where her father Salomon was a dealer in furniture. The family moved in 1888 from Rotterdam to Den Haag, but stayed there shortly. Leentje however was sent again to Den Haag in August 1895, where she stayed with a brother of her father but in December 1896 she came back home in Rotterdam.
On 30 September 1914, Leentje left her parental home forever as she was taken in at Maasooord, a Psychiatric Hospital in Poortugaal where she stayed until 20 September 1916. Per that date she was registered in the Peoples Registry of Apeldoorn: Leentje was hospitalized in the Central Israëlitic Psychiatric Hospital Het Apeldoornsche Bosch. She stayed there until the end of her life: Leentje van Geldere passed away there at the age of 74 on 24 April 1942.
Sources include the City Archive of Rotterdam family registration cards of Salomon van Geldere (1834) with Leentje van Geldere; website archieven.coda-Apeldoorn.nl/peoples registty/Leentje van Geldere and the certificate of death nr. 210 made out in Rotterdam in May 1942 for Leentje van Geldere, deceased in Apeldoorn on 24 April 1942.