Jan Tjeerds Jongsma
- Born: 5 Sep 1868, Sumar (Suameer) Tietjerksteradeel Friesland Netherlands
- Marriage: Neeltje Wolters Fennema on 11 May 1901 in Bergum (Burgum) Tietjerksteradeel Friesland Netherlands
Jan married Neeltje Wolters Fennema, daughter of Wolter Folkerts Fennema and Janke Harkes van der Meulen, on 11 May 1901 in Bergum (Burgum) Tietjerksteradeel Friesland Netherlands. (Neeltje Wolters Fennema was born on 27 Jul 1875 in Sumar (Suameer) Tietjerksteradeel Friesland Netherlands and died in 1956 in Leeuwarden Friesland Netherlands.)
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