1. | Johannes Cornelis Jansma Family/Spouse: Cornelia Postma. [Group Sheet] [Family Chart]
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2. | R. Jansma (1.Johannes1) R. married C.P. van Kalsbeek [Group Sheet] [Family Chart]
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3. | P.M. van Kalsbeek (2.R.2, 1.Johannes1) |
4. | J.K. van Kalsbeek (2.R.2, 1.Johannes1) |