1Charles Hudson, History of the Town of Lexington, Middlesex County, Massachusetts from its First Settlement to 1868, Vol. 2--Genealogies, Revised and Continued to 1912, pp. 4-5 (1913)
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"4. JOHN3 (George,2 George1), born 2 Sept. 1688, died 18 May 1774.
The will of John Adams dated 24 May 1773, entered for probate 6 Sept. 1786, was disallowed. In it he names his son Samson, he to support testator's wife; sons Mephiboseth, John, Abijah, George; daughters Prudence Adams, Mary Peirce, and Sarah Reed. On June 5, 1788, the heirs were Mephiboseth Adams, John Adams, Mary Peirce, Sarah Reed, Abijah Adams, Prudence Adams, George Adams, Samson Adams.
He married at Watertown, 27 Oct. 1714, MARY FLAGG, of Watertown; secondly 24 Nov. 1743 MARY SANDERSON of Waltham, who died 21 July 1786, aged 96; adopted daughter of John and Hannah (Stratton).*
Children, all born at Lexington:
6. i. MEPHIBASHETH,4 b. 3 July 1715.
ii. JOHN, b. 22 Feb. 1716-17.
iii. MICHAEL, or MICAH, b. 14 Aug. 1718; d. 19 Aug. 1747.
iv. MARY, b. 27 Feb. 1720-21; m. (intention dated 9 Apr. 1743) JONAH6 PIEIRCE of Weston.
v. ABIJAH, b. 3 Jan. 1722; m. 19 Jan. 1742-43 MARY BAKER of Waltham.
vi. PRUDENCE, b. 1 Apr. 1727.
7. vii. SAMSON, or SAMPSON, b. 25 Aug. 1729.
8. viii. GEORGE, b. 17 May 1733.".
1Lance Ware, Ware/Erdman/Williams/Ingalsbe Family, 3 JULY 2005.
URL = http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=ware&id=I7646 This straightens out the confusion on which Mary Flagg married which husband.
"John (3) Adams married Oct. 27, 1714, Mary Flagg, at Watertown. There were three granddaughters of old Thomas (1) Flagg at Watertown named Mary; and Bond has quite confused their marriages, and I have spent considerable study in straightening them out. Mary (3) (Allen 2, Thomas 1), born about 1690, married, according to Bond, 1706, William Pike of Framingham. Mary (3) (Michael 2, Thomas 1), born Dec. 7, 1690, married, according to Bond, Dec. 13, 1711, William Hagar. Mary (3) (Gershom 2, Thomas 1), born Feb. 2, 1682-3, married, accroding to Bond (with a question-mark), Oct. 27, 1714, John (3) Adams (George 2-1). Only Michael Flagg, of the three brothers, left a will, and in it, under date 1711, he mentions his daughter, Mary Flagg, showing that she was unmarried then. Allen Flagg died 1712, and in settling the estate his widow, Sarah, mentions a sum of money due her son-in-law, William Hagar. This proves that Mary (3) (Allen 2, Thomas 1) was the one who married, Dec. 13, 1711, William Hagar. Mary (3) (Michael 2, Thomas 1) was unmarried in 1711, so it must have been Mary (3) (Gershom 2, Thomas 1) who married, 1706, William Pike, and her birthdate shows she was of the right age. This leaves Mary (3) (Michael 2, Thomas 1), born Dec. 7, 1690, to marry, Oct. 27, 1714, John (3) Adams. She named a son Michael for her father, and a daughter Prudence for her sister. W. W. N. Y. Text: 19 Jul 1915, #4884."