The grand-daughter in the 1861 census is called Winifred LLOYD not STIDWORTHY. Her age implies a birth in 1850, and indeed there is a Winifred Lloyd born in Liverpool in 1850

The marriage cert of Bridget Lloyd to Napoleon Henry Stidworthy is in 1844.

One would have expected the child to have been Winifred Stidworthy if she was a legitimate child of this marriage.

If she is a child of the marriage, why use the Lloyd name?