Mary was the daughter of Mercy/Marcey Jones and her husband John Thwing.

THWING children (1 known):

1. Mary Thwing (2/9/1720-11/20/1739) B-Hull, MA, died in (_), m. Nathaniel Rawson on 3/21/1738. Mary died after giving birth to Silas.
...1 RAWSON child:
...Silas Rawson who went on to marry twice and sire 21 children.
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Reference:

"Thwing: A Genealogical, Biographical and Historical Account of the Family," by Walter E. Thwing, 1883, p. 22.
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From Rawson archivist, Alison Franks, 2013:

MARY5 THWING (JOHN III4, JOHN II3, JOHN I2, BENJAMIN1) was born 09 Feb 1719/20 in Mendon, Worcester, Massachusetts [vr pg 192], and died 02 Nov 1739 in Mendon, Worcester, Massachusetts [vr pg 491]. She married NATHANIEL RAWSON 02 Mar 1737/38 in Mendon, Worcester, Massachusetts [vr pg 411], son of NATHANIEL RAWSON and HANNAH THOMPSON. He was born 27 May 1716 in Braintree (Quincy), Norfolk, Massachusetts, and died 23 Jul 1803 in West Stockbridge, Berkshire, Massachusetts [vr pg 107] [87y].

Source: "Massachusetts, Town Clerk, Vital and Town Records, 1626-2001," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:Q29P-MKDR : 10 November 2020), Marcy in entry for ...y Thwing, 9 Feb 1719; citing Birth, Mendon, Worcester, Massachusetts Bay Colony, British Colonial America, Massachusetts Secretary of the Commonwealth, Boston; FHL microfilm 007011111.
Contributor: laura hughes (46960853)

More About NATHANIEL RAWSON:

Burial: Center Cemetery, West Stockbridge, Berkshire, Massachusetts

Military service: Revolutionary War

More About NATHANIEL RAWSON and MARY THWING:

Marriage: 02 Mar 1737/38, Mendon, Worcester, Massachusetts [vr pg 411]

Child of MARY THWING and NATHANIEL RAWSON is:

2. i. SILAS6 RAWSON, b. 17 Nov 1739, Mendon, Worcester, Massachusetts [not recorded]; d. 26 Aug 1819, Palmyra, Wayne, New York.