Oh my goodness Arranroots, you've given me a lot of info to work with, thank you so much!
I didn't have any of those other census returns except the 1861 Rossiter one (and the one I have says that Eliza was born in Cold Blow 'Narburth', which I'm thinking was Narberth?)
The link I'm hoping to make here is between something I've read from a book 'The Golden Falcon' and my own William Winter, the one who was with the Rossetters in 1861.
In the book there's info on a young William and Sarah Winter moving from Somerset to Wales, he a poulterer, and they had 14 children. Not all of their names were mentioned, but there was a Ben, Edward, Tim, Charles mentioned, and he also said that his father (who isn't named in the narrative) had said there was always a John in the family. It also includes an 1861 census return:
(Narberth, Pembrokeshire 1861 census No. 4149 - No. 37, Red Stone: William aged 47, poulterer born Brompton Ralph, Somerset, Sarah wife aged 48, born Widescombe, Somerset, son John aged 23, cabinet maker born Tenby, Pembrokeshire, Sarah aged 11, born Tenby, Timothy aged 12 scholar born Narberth, Joseph aged 11, Sophia aged 8, Charles aged 6, Julia aged 4, Eva aged 2).
my own William Winter, nephew of Henry/Ruth Rossetter, born 1840 n Tenby Wales, who's father was also William, a poulterer. So that last one with Sarah Winter and sons, seems to fit both. I don't want to count chickens before they hatch ( a poulterer pun?

) but I will look into it further, thank you so much!!
One question - can you tell me what the 'N' and 'Y' stand for on the 1841 census?
And if you have access to the info, is there further information on that Sarah Winter and sons, in the following census? (I'm also wondering where her husband William was on this night). I hope I'm not asking too much, you've already given me heaps to go on!
Leigh x