Assuming that I've got the right birth registrations:
Emma - 1844 - Leeds - mmn = Hall
Alfred - 1848 - Leeds - mmn = Hall
Marriage: Leeds - 1840 - John Parkin and Elizabeth Hall appear on the same page. Marriage at St Peter, 25 December 1840:
John Parkin, fa, Cloth dresser of Woodhouse. Father: James, Labourer
Elizabeth Hall (x), fa, of Woodhouse. Father: William, Cloth Dresser