Jacob van Ullem was the son of Jonas van Ullem and Rachel Schenkkan. He married Carolina Waterman in Amsterdam in 1937. Amsterdam Municipal Archives; record card of Jacob van Ullem
In addition, a Jokos file (number 52738) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 12030/22134).