- Born: 19 Mar 1831, Tved Sogn, Hillerslev Herred, Thisted Amt 24555
- Marriage (1): Ellen Pedersen
- Marriage (2): Maren Kirstine Christiansdatter
- Died: 21 Nov 1915, Alleen 27, Thisted Købstad, Thisted Sogn, Hundborg Herred, Thisted Amt at age 84 24555
- Buried: 28 Nov 1915, Thisted Vester Kirkegård 24555
 Other names for Bertel were Bertel Nielsen Kjær 24556 and Bertel Nielsen.
Bertel married Ellen Pedersen, daughter of Peder Bertelsen and Ane Jensdatter. (Ellen Pedersen was born on 6 Aug 1820 in Nors Sogn, Hillerslev Herred, Thisted Amt, died on 2 Mar 1880 in Brund, Hillerslev Sogn, Hillerslev Herred, Thisted Amt and was buried on 9 Mar 1880 in Hillerslev Kirkegård.)
Bertel next married Maren Kirstine Christiansdatter, daughter of Christian Thøgersen and Ane Bertelsdatter. (Maren Kirstine Christiansdatter was born on 3 Jun 1843 in Tved Sogn, Hillerslev Herred, Thisted Amt 24553, christened on 16 Jul 1843 in Tved Kirke and died after 1915.)
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