Jan Sakes Hamstra
- Born: 16 Dec 1830, Achtkarspelen Friesland Netherlands
- Marriage: Dieuwke Jilles van Dekken on 26 Jul 1856 in Achtkarspelen Friesland Netherlands
- Died: 5 Apr 1910, Achtkarspelen Friesland Netherlands at age 79
Jan married Dieuwke Jilles van Dekken, daughter of Jille Gerkes van Dekken and Hinke Sikkes Pitstra, on 26 Jul 1856 in Achtkarspelen Friesland Netherlands. (Dieuwke Jilles van Dekken was born on 6 Jan 1834 in Achtkarspelen Friesland Netherlands and died on 17 Nov 1913 in Achtkarspelen Friesland Netherlands.)
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