Egbert married Jantjen Sijbes on 23 Apr 1763 in Veendam, Groningen, Nederland. Jantjen was born on 22 Feb 1734 in Nieuwolda, Groningen, Nederland; was christened on 28 Feb 1734 in Nieuwolda, Groningen, Nederland; and died. [Group Sheet] [Family Chart]

1. Aaltjen Egberts Koiter was born in 1765 in Veendam, Groningen, Nederland; was christened on 16 Jun 1765 in Veendam, Groningen, Nederland; and died.
2. Sijben Egberts Koiter was born in 1766 in Veendam, Groningen, Nederland; was christened on 05 Oct 1766 in Veendam, Groningen, Nederland; and died.
3. Hijltje Egberts Koiter was born in 1769 in Veendam, Groningen, Nederland; was christened on 05 Feb 1769 in Veendam, Groningen, Nederland; and died.
4. Geert Egberts Koiter was born in 1770 in Veendam, Groningen, Nederland; was christened on 09 Dec 1770 in Veendam, Groningen, Nederland; died on 04 Aug 1828 in Veendam, Groningen, Nederland.
5. Hijltje Egberts Koiter was born in 1773 in Veendam, Groningen, Nederland; was christened on 31 Jan 1773 in Veendam, Groningen, Nederland; died on 08 Oct 1841 in Veendam, Groningen, Nederland.
6. Hinderkien Egberts Koiter was born in 1775 in Veendam, Groningen, Nederland; was christened on 22 Jan 1775 in Veendam, Groningen, Nederland; died on 20 Jun 1830 in Wildervank, Groningen, Nederland.
7. Jantje Egberts Koiter was born in 1778 in Veendam, Groningen, Nederland; was christened on 02 Aug 1778 in Veendam, Groningen, Nederland; died on 09 Apr 1826 in Veendam, Groningen, Nederland.