[article refuting identification of Samuel's mother as Mary Belcher in favor of Mary Bartlett. Besides marriage records documented on appropriate Family pages, it cites the following.]
Essex deed Vol. 94, folio 263 where on 9 Feb 1750, Nathaniel Bartlet of Marblehead ... Inholder of the first part, Andrew Tucker of s'd Marblehead Marriner & Mary his wife of the Second part & Sarah Prebble of s'd Marlbehead Widow of the third part ... Heirs at Law to their Father Nathaniel Bartlet late of s'd Marblehead Inholder Dec'd" agree to partition the estate.