Marcus Katan was the son of Jacob Katan. He was married. His wife survived the war. They had a daughter Annette who was killed during the war.
NIOD, Records Stichting Sieraden-Comité, box HF 15, file 228
In addition, a Jokos file (number 239) 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 6169/11140).