I too am descended from Matthew RODHAM of Northumberland County, VA. What I can tell you briefly is this:
he was born 1620 in England and came to Kent County, Maryland when he was 14.
father: Edmund RODDAM(spelling change)b.1589 Roddam England
Mother: Margaret GREY
Edmund parents were: Robert RODDAM b.1563
Barbara Fo(r)ster b. 1569
Margaret parents: SIR Ralph GREY b.1569
Isabel GREY b. 1572
Still working back from there, let me know if this helps.
Gary Moseley email@example.com