On 4 Sep 1708 when Joseph was 21, he married
Rebecca Wallis, daughter of
John Wallis (-13 Sep 1690) &
Mary Phippen (5 Mar 1644-), in Beverly, MA.
Born ca 1683. Rebecca died aft 1761.
Rebecca, widow Groves. Children of Joseph and Rebecca (Wallis) (Groves) Foster, born at Beverly:
i. Joseph Foster, b. 15 Aug 1709, d. mar 1755 at sea, m. 1st at Beverly 18 Nov 1731 Hannah Patch, m. 2nd at Beverly 17 Oct 1736 Hannah Morgan (dau. of Robert & Mary (Thgorndike) Morgan);
ii. Benjamin Foster, b. 10 Feb 1710/1, d. soon;
iii. Benjamin Foster, b. 3 Feb 1711/2, d. 10 Nov 1718;
iv. Lydia Foster, b. 5 May 1714, d. 28 Aug 1800 at Beverly, m. 17 Aug 1731 Peter Ober;
v. Josiah Foster, b. 8 Nov 1715, m. at Beverly 8 Jun 1738 Anna Thistle;
vi. Samuel Foster, b. 20 Aug 1717, d. 24 Apr 1775 at Beverly, m. 31 Aug 1741 Mary Thorndike (dau. of Paul & Mary (Batchelder) Thorndike);
vii. Mary Foster, b. 1 Aug 1719, m. at Beverly 13 Apr 1742 Ezra Chapman;
viii. Benjamin Foster, b. 2 Aug 1721, m. at Beverly 14 Sep 1742 Abigail Herrick;
ix. Sarah Foster, bp. 22 Sep 1723, d. soon;
x. Sarah Foster, b. 19 Oct 1725, m. at Wenham, MA, 30 Mar 1748 Elisha Dodge; and
xi. Jonathan Foster, b. 18 Jun 1729, m. at Beverly 8 Nov 1750 Mary Lovett.