Jan Tjerks Hamstra
- Born: 20 Jan 1845, Achtkarspelen Friesland Netherlands
- Marriage: Ypkjen Smeding 20 May 1871, Achtkarspelen Friesland Netherlands
- Died: 20 May 1908, Achtkarspelen Friesland Netherlands at age 63
Jan married Ypkjen Smeding, daughter of Sytze Johannes Smeding and Ytje Hendriks Stiksma, on 20 May 1871 in Achtkarspelen Friesland Netherlands. (Ypkjen Smeding was born on 25 Dec 1845 in Achtkarspelen Friesland Netherlands and died on 31 May 1908 in Achtkarspelen Friesland Netherlands.)
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