Betsij Heertje (c.1882 - d.) - Genealogy (geni.com)
https://archief.amsterdam/indexen/deeds/9853340f-3f48-56a3-e053-b784100ade19?person=9853340f-3f49-56a3-e053-b784100ade19
Fate siblings: https://www.joodsmonument.nl/en/page/181757/levie-heertje