On 10 Apr 1771 when Isaac was 28, he married
Mary Rowland, daughter of
Thomas Rowland (22 Sep 1721-15 May 1808) &
Tamson Jacocks (25 Dec 1721-17 Aug 1798), in Fairfield, CT.
Born on 24 Nov 1754 in Fairfield, CT. Mary died in Norfolk, Ontario, on 5 Sep 1822; she was 67.
Children of Isaac and Mary (Rowland) Gilbert, the first five born at Ridgefield, the others in New Brunswick:
i. Rowland Gilbert, b. 20 Mar 1772, d. 15 Oct 1859 at Norfolk, Ontario, m. at Gagetown, New Brunswick, 27 Nov 1797 Phebe Thurston (b. 9 May 1775 at Hempstead, Long Island, d. 22 Apr 1853 at Milton Grove, Charlottville, Ontario);
ii. Betsey Gilbert, b. Feb 1774;
iii. Abigail Gilbert, b. 16 Jul 1775, d. 10 Oct 1777;
iv. Phebe Gilbert, b. 11 Dec 1780, d. 7 Mar 1812;
v. Sarah Gilbert, b. 12 Dec 1782;
vi. Mary Gilbert, b. 7 Jun 1785;
vii. Isaac Gilbert, b. 2 Mar 1787;
viii. Ruth Gilbert, b. 4 Jan 1789;
ix. Abigail Gilbert, b. 16 Ocr 1790;
x. Rebecca Gilbert, b. 20 Jun 1792, d. 27 Apr 1794;
xi. David Gilbert, b. 17 Oct 1793;
xii. Rebecca Gilbert, b. 22 Mar 1794; and
xiii. Ebenezer Gilbert, b. 14 Apr 1797.