I'm looking for John Greenwood (b.c1825, Liverpool) who married Mary (b.c1832 either Liverpool or Dublin) and may have a son Thomas b.c 1860. They are in Chester in 1851 and 1871, but not 1861 and I don't think they are in Liverpool either!
I've found in 1861 A John Greenwood b.1825 Lancashire. Spouse Mary Res city Lancashire.Have you seen that? if not put a request on the Lancashire census lookup board for the 1861 census.Hope this helps.