Could you give his stated age per 1841 and 1851 census and do you have the names of Mary's parents?
Are these all the children?
MARY CAMPBELL Female Christening: 21 AUG 1814 Lowther, Westmorland, England
CATHERINE CAMPBELL Female Christening: 20 JUL 1817 Lowther, Westmorland, England
ISABELLA CAMPBELL Female Christening: 18 JUN 1820 Lowther, Westmorland, England
DAVID CAMPBELL Male Christening: 11 DEC 1822 Lowther, Westmorland, England
ROBERT CAMPBELL Male Christening: 19 NOV 1825 Lowther, Westmorland, England
HANNAH CAMPBELL Female Christening: 21 DEC 1828 Lowther, Westmorland, England