Hi Laura,
It seems that somewhere along the way, someone confused or incorrectly combined information about Thomas Welles dau. Mary (m. Timothy Baldwin) and her sister Anne (m 1 Thomas Thompson; m2 Anthony Howkins).
Have added the two sources that follow to the profile of Mary Baldwin.
*Robert Charles Anderson, Great Migration: Immigrants to New England, 1634-1635, Volume VII, T-Y (2011), 288-292 for "Thomas Welles"; digital images, AmericanAncestors.org (accessed 2014).
*Donald Lines Jacobus, An American Family: Botsford-Marble Ancestral Lines' (1933), 28-37, "Ancestry of Hannah Baldwin" for both "Baldwin Family" and "The Welles Connection"; digital images, Heritage Quest (accessed 2014 via a local library Internet portal).