I would say your Francis who married Ann Prior at Downham Market was the Francis bp.29/12/1726 at Denver (immediately south of Downham Market, and inbetween DM and Fordham) son of Francis and Clementine. Siblings are:
Rebeccah bp.Nov.1718 Downham Market
Matthew bp.13/4/1720 Denver
Ann bp.29/12/1726 Denver (same date as Francis above)
Sarah bp.5/1/1729 Denver
Jane bp.17/6/1731 Denver
William bp.2/1/1734 Denver
Francis Hopkin married Clementine Clayton 19/12/1717 Downham Market
Annette