The marriage record gives her name as Mrs. Elizabeth Kinnecutt, but she must have been Sarah because the births of their children give her name as Sarah.
1755 MUNRO, Nathan, of Warren, and Mrs. Elizabeth Kinnecutt, of Bristol; m. by Rev. John Burt, May 25, 1755. Vol. 1 p. 74 Marriage Bristol
At the time of his marriage, Joseph was of Bristol.
He was a private and seaman from RI in the Revolutionary War. (source: RI Gen. Regis. Vol. 19 p. 280)
I have roughly estimated the birth years of some of Joseph & Mary's children.
According to the death record at Bristol, Joseph, a Revolutionary Pensioner, died at age 89. (Deaths Vol. 4 p. 112)
Joseph's will mentions the following family members: sons Nathan, Caleb, David, Bosworth H., & Joseph Jr.; daughters Abby Bunn w/o Lemuel Bunn, Christiana Handy, & Sally Munroe; and daughter-in-law Nancy Munroe.