On 10 Sep 1735 William first married Hannah Harrington (37903) , daughter of George Harrington (18537) (31 Aug 1695-) & Hepzibah Fiske (34512) (13 Jan 1693/4-26 Mar 1736), in Sudbury, MA.30 Born on 31 Jul 1716 in Watertown, MA.30 Hannah died on 30 Apr 1740; she was 23.30 Hannah died in childbed.

Children of William and Hannah (Harrington) Whitney:
    i. William, b. 10 Apr 1736, m. 4 Jun 1762 Mary Mansfield;
    ii. Hannah, b. 16 Feb 1737/8, m. 25 Apr 1757 Henry Spring of Weston; and
    iii. Phineas, b. 23 Apr 1740, d. 1819, grad. Harvard 1759, ordained at Shirley 23 Jun 1762 as the first settled minister, m. 1st at Weston 23 Apr 1762 Miriam Willard of Harvard (d. 20 mar 1769), m. 2nd 1770 Lydia Bowles (d. 11 Oct 1805), m. 3rd widow Jane Garfield (d. 4 mar 1824).30

On 30 Mar 1742 William second married Mary Chadwick, daughter of Ebenezer Chadwick (3 May 1683-16 Apr 1725) & Abigail Grant (2 Jan 1683/4-21 Dec 1769).30 Born on 26 Feb 1715 in Sudbury, MA. Mary died in Weston, MA, on 23 Feb 1756; she was 40.30

Children of Jacob and Mary (Chadwick) Peirce:
    i. Thankful, b. 1 Nov 1736, and
    ii. Jacob, b. 7 Mar 1738.30

Children of William and Mary (Chadwick) (Peirce) Whitney:
    i. Mary, bp. 17 Dec 1742;
    ii. Mary, b. 11 Dec 1744, m. 29 May 1777 Amos Fiske of Waltham;
    iii. Sarah, b. 6 Sep 1736;
    iv. Nathaniel, b. 1 May 1748, d. 10 Oct 1751;
    v. Joel, b. 22 Dec 1749, d. Feb 1749/50;
    vi. Susanna, b. 23 Dec 1751, m. 14 May 1778 Isaac Mead; and
    vii. Abigail, b. 30 Dec 1753, m. 14 May 1778 Samuel Custis of Marlboro.30

On 12 Aug 1756 William third married Margaret Gates (24493) , daughter of Amos Gates (9461) (11 Oct 1681-22 Jul 1754) & Hannah Oldham (10 Oct 1681-bef 24 Jan 1763).30 Born on 23 Apr 1708 in Brookline, MA. Margaret died in Weston, MA, on 15 Oct 1764; she was 56.

14 Jan 1763 (Int) William fourth married Sarah Pierrepont.30 Born on 11 Nov 1714 in Roxbury, MA.

Sarah, of Brookline, widow of Joshua Davis.

On 14 Oct 1730 when Amity was 18, she married Labbeus Graves, son of Richard Graves (7 Apr 1672-) & Joanna, in Sudbury, MA. Born on 22 Jun 1705 in Sudbury, MA. Labbeus died in Killingly, CT, on 12 Dec 1757; he was 52.

20 Jan 1733/4 Martha married Timothy Mosman, son of Timothy Mosman (17 Nov 1679-27 Feb 1773) & Sarah Hicks (19 Mar 1681-19 Sep 1740), in Weston, MA. Born on 5 Mar 1710 in Dorchester, MA. Timothy died in Westminster, MA, on 5 Sep 1801; he was 91.

Timothy Mosman, also spelled Mossman, of Sudbury.

On 20 Oct 1741 when Samuel was 22, he married Abigail Fletcher, daughter of John Fletcher (26 Aug 1692-ca 1749) & Mary Goble (19 Feb 1693/4-27 Mar 1734), in Weston, MA.30 Born on 2 Jul 1720 in Concord, MA. Abigail died in Ashburnham, Worcester County, Massachusetts aft Apr 1783.