his wife, Anna https://www.joodsmonument.nl/nl/page/159036/anna-kool-brandon
Hijman Leman Kool (1906 - d.) - Genealogy (geni.com)
https://archief.amsterdam/indexen/deeds/98533419-7da5-56a3-e053-b784100ade19?person=98533419-7da6-56a3-e053-b784100ade19
Fate relatives: https://www.joodsmonument.nl/en/page/159016/meijer-kool