Jan Frederik Posthuma
| Sex: | Male | |
| Father: | Gerhardus Webes Posthuma | |
| Mother: | Maria Uurlaan | |
| Birth: | (ca 1805) | Dokkum, FR, NL |
| Death: | 14 Jun 1870 | Groningen, GR, NL |
Family 1
| Spouse/Partner: | Freerkje Jans van der Schaaff | b. 20 Sep 1808 d. 13 May 1877 |
| Civil: | 29 May 1828 | Dokkum, FR, NL |
| Children: | ||
Maria Posthuma
 |
b. 3 Oct 1829 d. 7 May 1906 | |
| Freerkje Posthuma
|
b. 17 Jun 1831 d. 10 Sep 1860 | |
Gerardhus Posthuma
 |
b. 5 Mar 1833 d. (?) | |
| Aaltje Posthuma
|
b. 5 Jan 1835 d. (?) | |
| Akke Posthuma
|
b. 5 Sep 1836 d. (?) | |
| Grietje Posthuma
|
b. 9 May 1838 d. 16 Jul 1905 | |
| Anna Posthuma
|
b. 17 Apr 1843 d. 25 Jul 1866 | |