her sister Emma https://www.joodsmonument.nl/en/page/27924/emma-van-os-leezer
Bertha Zelechowski and her husband emigrated to Palestina in 1946:
https://archief.amsterdam/indexen/deeds/985333f2-1de6-56a3-e053-b784100ade19?person=985333f2-1de7-56a3-e053-b784100ade19