Will of Samuel Sturtivant of Plymouth, dated 1 Aug 1669, probated Plymouth 29 Oct 1669, only names sons Samuel, James, John, Joseph, and son-in-law John Waterman, and child "my wife now goeth with (if a boy)".
[Since he has several daughters besides Ann who m. John Waterman, it appears he made no attempt to name his daughters, thus this offers no information either way about whether Mary was his daughter]