Cato Bloemhof was a daughter of Salomon Abraham Bloemhof and Roosje Ossendrijver. From her father's first marriage she had two sisters, Judith and Reintje and a brother Mozes, who were all murdered with their families during the Shoah. After the death of Roosje Ossendrijver, her father married Anna …
In addition, a Jokos file (number 004375) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.