Is it possible that Charlotte died and James re married?
1881 Wales Census (As transcribed) For 'Rverdea' read 'Ruardean'
Ada Cook abt 1877 Blaenavon Daughter Llanover Monmouthshire
George Cook abt 1865 Rverdea, Gloucestershire, England Son Llanover Monmouthshire
James Cook abt 1836 Reverdea, Gloucestershire, England Head Llanover Monmouthshire
James Cook abt 1871 East Dean, Gloucestershire, England Son Llanover Monmouthshire
Mary Ann Cook abt 1841 Rverdea, Gloucestershire, England Wife Llanover Monmouthshire
Richard Cook abt 1867 Little Dean, Gloucestershire, England Son Llanover Monmouthshire
Sarah Cook abt 1866 East Dean, Gloucestershire, England Daughter Llanover Monmouthshire
Thomas Cook abt 1871 Upper Llanbrecford, Monmouth, Wales Son Llanover Monmouthshire
William Cook abt 1869 Little Dean, Gloucestershire, England Son Llanover Monmouthshire