Louise Velleman was a daughter of Joseph Velleman and Fanny Manheim. She married in Amsterdam on 6 February 1935 to Markus Peper. Louise had two other sisters: Marianne and Clara, who survived the Holocaust.
City Archive of Amsterdam, archive card of Joseph Velleman
In addition, a Jokos file (number 20977) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.