Yeap a bit of a conundrum

Hannah C is not shown as step daughter to head of household in the 81/91 census data

or with "father" James in 1871

1871 Pillowell
James Ruck Head - Male 35 1836 Coal miner West Dean, Gloucestershire, England
Frances Ruck Wife - Female 27 1844 - West Dean, Gloucestershire, England
Mary Ann Ruck Daughter - Female 6 1865 Scholar West Dean, Gloucestershire, England
George Ruck Son - Male 3 1868 - West Dean, Gloucestershire, England
Thomas Jim Ruck Son - Male 0 1871 - West Dean, Gloucestershire, England

Surname Forename(s) Surname Forename(s) Year Register Entry
RUCK James JONES Frances 1864 2 61

an avenue that might require further investigation is

Births Mar 1868 (>99%)
James Hannah Cecilia Chepstow 11a 17

who is missing in 1881/91 censuses - but how a Wharf workers daughter from Lydney morphs into Hannah C Ruck is beyond me at the momnet