The ancestry of David Potter Shreve appears to be a.) Lewis Shreve and Elizabeth Potter b.) James Shreve and Mary Williams c.) Caleb Shreve and Hannah Thorne d.) Joshua Shreve and Jane e.) Caleb Shreve and Sarah Areson f.) Thomas Sheriff and Martha. This information comes from "The Genealogy and History of the Shreve Family from 1641" by L.P.Allen. You can obtain this book through The Higginson Book Company at www.higginsonbooks.com. There is a lot of additional information contained in the book.