|Identity of Maria|
That Thomas (58) is the father of Christiana (29) is fairly certain.
Maria's name comes from the most likely baptism for Chrissy.
There is a likely marriage for Thomas and Maria Wakeman which says she was a widow.
George Wakeman Harris was baptised about 6 weeks before they married, his parents listed as Thomas and Maria Harris.
It is possible that George was therefore the son of her late husband.
Thus the fact that Maria was the name of Chirstiana's mother seems fairly certain.
However, further identification need more work and corroboration.
It would help to find Christiana in the 1841 Census, but she has not been identified.