According to Mr. Jacobus, the identification of William Warland's wife as the daughter of James and Sarah (Mansfield) Thomas was probable, but not proven.
"… Mary [da. James & Sarah (Mansfield) Thomas], b c. 1761, bp 18 Jan 1795 (church record, Trinity Church [Prot. Ep.], New Haven), d 21 Feb 1823 æ. 61 (gravestone, City Burial Ground, New Haven), 22 Feb æ. 62 (church record, Trinity Church [Prot. Ep.], New Haven (New Haven Vital Records))"