Leon Sleutelberg was the son of Levie Sleutelberg and Roossien van Hoorn. He got married to Gelle Gans, daughter of Meijer Gans and Sophia Bollegraaf. Shortly before they were deported Leon Sleutelberg and Gelle Gans lived in Amsterdam. They lived at the address Joden Houttuinen 60.
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Leon (Lont) Sleutelberg played soccer in the Delfzijl soccer team D.V.V. He married Gelle Gans in 1939. There is an engagement photo of Leon and Gelle in:
J. Bottema, Ze waren onder ons : 300 jaar joden in Delfzijl 1642 - 1942 (Delfzijl 1980) 71
For an anecodte about a birthday party of Gelle Gans, see: J. Bottema, Ze waren onder ons : 300 jaar joden in Delfzijl 1642 - 1942 (Delfzijl 1980) 111