Lieut. John Tracy, only known s. of Stephen Tracy & Triphosa Lee, was b. circa 1633-4 prob. at Duxbury, Mass. He is mentioned in the Mar. 20, 1654/5 will of his father, written at London, England: "to my sonne John Tracye what land and house I have there in Duxburrow alsoe one yoake of oxen and one horse."At an unknown date, John Tracy m. Mary Prence, dau. of Gov. Thomas Prence of the Plymouth Colony and his 2nd wife Mary Collier, prob. b. at Duxbury, Mass.
This site lists several children, but not daughter named Mary.
Find A Grave Memorial# 48208128 http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=48208128