Abraham van Hoorn was the son of Levie van Hoorn and Hillechien Meijer. Abraham was cattle dealer. He married to Sara Bamberg, who died in 1935. They had four children: Hillechina Rosina, Eduard, Rosina and Levi.
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In addition, a Jokos file (number 54142) on this household 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 5413 / 16711).