Samuël Bromberg was a son of Jeremias Bromberg and Johanna Loeb. The couple had four children of whom Samuël was the second youngest. His mother Johanna passed away in 1911. Jeremias got remarried to Paula Rosenfeld in 1914.
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Samuël Bromberg studeerde van 1909 tot 1918 aan de Universiteit van Amsterdam. Hij promoveerde tot doctor in de rechtswetenschap op 26 maart 1918 op stellingen.