It's quite common to register an illegitimate child in her mothers name then adopt the fathers.
It may be that Jane Christian married James Harris 1817 and had Thomas. James died say 1822.
By 1851 at Sand St Ramsey:-
Thomas Harris 28 Coachman Ramsey
Mary Crow 34 Half Sister, Servant Ramsey
John Sayle 18 Half brother Mariner Ramsey
Len Faragher
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