Hermanus de Haas was a son of Salomon de Haas and Lena Eijl. He married 17 December 1930 in Rotterdam to Betje Hammelburg, a daughter of Mozes Hammelburg and Beela Buitenkant.
website www.wiewaswie.nl.
In addition, a Jokos file (number 12732) on this person 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 4581/3626).