Sientje Bonavang was the daughter of Nathan Bonavang and Roosje Velleman. She married 7 June 1922 in Rotterdam to Emanuel Cats, a son of Jacob Salomon Cats and Antje de Jong. The couple had one daughter: Antje.
City Archive of Rotterddam, index marriages, family registration card of Emanuel Cats and…
In addition, a Jokos file (number 50839) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.