On 27 Mar 1704 when Joseph was 21, he first married Mehitable Parsons, daughter of Joseph Parsons (ca 1635-15 Apr 1687) & Mehitable Bartlett (27 Feb 1651-), in Suffield, CT. Born on 2 Mar 1683 in Simsbury, CT. Mehitable died in Simsbury, CT, on 27 Nov 1725; she was 42.

Children of Joseph and Mehitable (Parsons) Seager, born at Simsbury:
    i. Joseph Seager, b. 30 Dec 1704, d. 4 May 1705;
    ii. Joseph Seager, b. ca. 1706, d. 9 Mar 1794 at Simsbury;
    iii. Amy Seager, m. 15 Aug 1732 Jonathan Westover;
    iv. Ann Seager;
    v. Jemima Seager, m. 20 Feb 1734/5 James Tuller;
    vi. Mary Seager, b. 3 Ded 1717, m. 26 Feb 1738/9 Sam Tuller; and
    vii. Rachel Seager, b. 16 Oct 1724, m. at Simsbury 5 Jun 1744 Stephen Pettibone.

On 4 Jan 1728 when Joseph was 45, he second married Mary Brown in Simsbury, CT.

Children of Joseph and Mary (Brown) Seager, born at Simsbury:
    i. John Seage, b. 24 Sep 1728, d. 1811 at Granby, CT;
    ii. Mehitable Seager, b. 4 Mar 1730;
    iii. Elizabeth Seager, b. 6 Feb 1732/3, m. Jul 1754 Isaac Buttolph;
    iv. Abigail Seager, b. 19 Jan 1734/5, d. 23 Oct 1734/5; and
    v. Abigail Seager, b. 3 Jul 1742.

On 2 Sep 1714 when Abigail was 22, she married Nathaniel Bacon.

On 28 Jan 1717 when Elizabeth was 22, she married John Hoskins.