Your info is correct so far as I got. Edward was married 3 times 1)Rachel Clark or Jacob (I think its Jacob) 2)Mary Duval and 3) Margaret Williams whom he married on 19 Sept 1734. I think that the mother of your Rachel is Rachel Clark or Jacob. Rachel Gaither married a Jeremiah Jacob in 1736 in Anne Arundel Maryland. I sugest that you e-mail Eva Thornburgh for more info.