On 25 Jun 1702 when John was 24, he first married Hannah Foss, daughter of John Foss & Mary Berry, in Hampton, Rockingham County, New Hampshire. Born ca 1682 in Dover, Strafford County, New Hampshire. Hannah died bef Nov 1718.

On 25 Nov 1718 when John was 40, he second married Mary Edmunds, daughter of Thomas Edmunds (26 Jun 1696-), in Portsmouth, Rockingham County, New Hampshire.

Mary, widow of Francis Mason.

9 Feb 1709/10 Richard married Mary Dow (10777) , daughter of Simon Dow (4 Mar 1666/7-2 Oct 1707) & Sarah Marston (3591) (20 Nov 1665-8 Mar 1697/8), in Hampton, Rockingham County, New Hampshire. Born on 19 Nov 1686 in Hampton, Rockingham County, New Hampshire. Mary died in Hampton, Rockingham County, New Hampshire, on 2 Jan 1755; she was 68.

Children of Richard and Mary (Dow) Jenness, born at Hampton or Rye:
    i. Sarah Jenness, b. 6 Mar 1710/1, d. 13 Feb 1741/2 at Greenland, NH, m. there 24 Oct 1734 Joshua Weeks (b. ca. 1707 at Salisbury, MA, d. 10 Feb 1736/7 at Greenland);
    ii. Mary Jenness, b. 27 Dec 1712;
    iii. Hannah Jenness, b. 4 Jul 1714;
    iv. Francis Jenness, b. 1 Dec 1715, d. 20 Jan 1784, m. Sarah Garland (b. ca. 1720/1 at Hampton, dau. of John & Elizabeth (Dearborn) Garland);
    v. Richard Jenness, b. 28 Jun 1718, d. 1782;
    vi. Simon Jenness, b. 1 Mar 1719/20;
    vii. Jonathan Jenness, b. 15 Oct 1721;
    viii. Samuel C. Jenness, b. 19 May 1724;
    ix. Joseph Jenness, b. 28 Feb 1726/7, d. 23 Feb 1815 at Rye.