Answering my own question here. She is a boarder, with husband James and a young child. There is another family who are also boarders. William has a wife called Isabella on that census so is there a reason why you think she may not be the mother?
Have you looked for a Harker/Anderson marriage to confirm your theory?
Andrea
Hi Andrea
Thank you for your reply.
Yes I have found a marriage for Hannah HARKER and James ANDERSON online but it does not give any fathers names. I do think William had more than one marriage, in 1851 his wife is transcribed as Eliza, I believe William may have married Isabella around 1869 so Eliza is more likely to be Hannah's mother. The reason I can also tie up with William is that in a later census William is transcribed as grandfather to a child of Hannah and James.
I just cant find Sands, Durham in 1861, as William is there in 1851 and 1871 I am fairly sure that is where he will be.
DeeNEdited re mistype William other wife in 1841/1851 is Eliza not Ann - sorry.