Looking for parentage of Dorcas OTIS b. ca. 1802 RI and married George P. BATES on Jan.31,1830 Windham Co. Conn. Dorcas appears on the 1850 Census Seneca Co. NY with son George and an elder woman, Sarah OTIS b. ca. 1760 RI. Is Sarah, the mother of Dorcas? Who is her father? Any help appreciated. Thank You.