Meijer Alter was a son of Hartog Alter and Sara van Gelder. Hij was first married to Selina Huisman. The couple had two children: Hartog en Philip. After Selina Huisman died in 1939, Meijer Alter got married to Naatje Snoek. She was the daughter of Mozes Snoek and Sara Porets.
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