I, too, am having great difficulty finding my Colwill/Colwell ancestors and I, too, am looking in Cornwall & Devon. John Colwill & Grace Trawin were married on 24 Dec 1826, we think in Devon, but don't know for sure. Their UK-born children were William (b. 2 June 1827; d. 6 Mar 1828), Tamsin/Tamzin (b. 05 Dec 1829), Elizabeth (b. 04 Oct 1831), & Mary Ann (b. 15 October 1833 in Burton Salmon, Yorkshire). But perhaps Mary Ann wasn't born in the U.K. Sometime between 1832 & 1835, they immigrated to the U.S., but we can't find them on any passenger lists. Interestingly, there is a Grace Trewin, baptized 18 Sep 1803 in Week St. Mary parish in Cornwall, dau. of John Trewin and Susanna Bray. Rustyrex mentioned descent from the Colwell/Colwill family of Cornwall and Devon, specifically the Poundstock and Week St. Mary areas. Could there be a connection here?