I can't find any historical evidence that George had a daughter named Mercy. I have found several versions of the following tree, including one by Cutter. More is included on George's profile. Should she be disconnected?
George Lawrence
(I.) GEORGE LAWRENCE, b. 1637; m., Sept. 29, 1657, ELIZABETH CRISPE. [See Crispe.] She d. May 28, 1681, and he m. (2d), Aug. 16, 1691. ELIZABETH HOLLAND (? wid. of Joseph.) His Will was dated 1707, and he d. Mar. 21, 1708-9. "an aged man," leaving wid. Elizabeth. Inventory £171. 5. 6. On Feb. 27, 1697-8, he and wife Elizabeth conveyed 10 acres of land in Wat. to Rev. John Emerson, of Charlestown, who immediately assigned it to Benjamin and Daniel Lawrence, twin sons of George. Nov. 3, 1691, he was by the Court excused from serving as Constable, "in that he could not read a word."
1. Elizabeth, b. Jan. 30, 1658-9; m., Oct. 18, 1681, Thomas Whitney. [Whitney, 33.] She was living at Stow, 1708-9.
2. Judith, b. May 12, 1660; m. about 1681, John Stearns. [C. Stearns, 16.]
3. Hannah, b. Mar. 24, 1661-2; (?) m. Obadiah Sawtel, of Groton.
4. John, b. Mar. 25, 1664; killed, June 15, 1674, by being run over by a load of bricks.
5. Benjamin, b. May 2, 1666, a waterman, of Charlestown; wife Anna. [See Coolidge, 46.]
6. Daniel (twin), b. May 2, 1666, a painter, of Charlestown, living there in 1708.
7. George, b. June 4, 1668; d. Mar. 5, 1735-6.
8. Sarah, m. Thomas Rider. [See Rider, also Barry, p. 383.]
9. Mary, b. Dec. 4, 1671; m., Ap. 5, 1689, John Earl, of Boston, and had dr. Mary, b. Jan. 9, bap. in Wat., June 22, 1690. It was probably Mary, wid. of John Earl, who m., Dec. 27, 1704, Michael Flagg. [22.] Her dr., Mary Earl, m., Oct. 10, 1708, Daniel Rait, of Wat. [Ball, 10.] [See Earl.]
10. Martha, m., Nov. 29, 1697, John Dix. [15.]
11. Grace, b. June 3, 1680; m. Edes, of Charlestown.
12. Joseph, mentioned in his father's Will.
13. Rachel, b. July 14, 1694; mentioned in her father's Will.
14. Patience (twin), b. July 14, 1694.
Bibliographic information:
Title Genealogies of the Families and Descendants of the Early Settlers of Watertown, Massachusetts, Including Waltham and Weston: To which is Appended the Early History of the Town
Authors Henry Bond, Horatio Gates Jones
Edition 2, reprint
Publisher N. E. Historic-genealogical society, for the benefit of the "Bond fund,", 1860
Length 1094 pages
Page 331
https://books.google.com/books?id=_oc6AQAAIAAJ&pg=PA331&lpg...
