Jacob Keizer was born 17 January 1819 in Venhuizen, Netherlands to Meindert Keizer (1778-1837) and Trijntje Naber (1784-1848) and died 17 March 1889 Hoogkarspel, Netherlands of unspecified causes. He married Trijntje Bakker (1824-1897) 7 May 1848 in Hoogkarspel, Netherlands.
Trijntje is his third cousin once removed: both descend from Pieter Roosendaal (1711-1788).
|Offspring of Jacob Keizer and Trijntje Bakker (1824-1897)|
|Meindert Keizer (1851-1926)||29 July 1851 Hoogkarspel, North Holland, Netherlands||29 January 1926 Nibbixwoud, North Holland, Netherlands||Aaltje Commandeur (1852-aft1889)|