Jesaias Pais married Mietje van Cleef in Amsterdam on 25 Februray 1942, a daughter of Emanuel van Cleef and Hadassa Wolff. City Archive of Amsterdam, archive card of Mietje van Cleef.
In addition, Jokos files (numbers 8651, 10020) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos files reveal that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 9108/4290).