I have that Margaret's parents were Sir Anthony Poyntz, 1480 - 1535, of Iron Acton, Gloucestershire, England, and Elizabeth Huddesfield, abt. 1482 - Bef. Apr 12, 1527; I show this John Newton's parents to be Thomas or Richard Newton, abt. 1477 - Jan 26, 1487/88, of East Harptree, Somersetshire, England, and Lettice (Lucy) HAMPTON, abt. 1481 - May 14, 1499, also of East Harptree, Somersetshire, England.
I can't give you sources other than to say, simply, RootsWeb.com.
Charles B. Gentry