I have a little mystery someone might be able to help with. I'm researching my G x 3 grandparents Evan Jones (b.1826) and Margaret (nee JOHNS, b.1829), who emigrated from Wales to Victoria, Australia in c.1855. I've found quite a bit of information on them from various (mostly Australian) sources including old newspapers, cemetery records, death certificate, etc. But I can't see them in the 1851 census anywhere.
According to Margaret's death certificate, they were married in c.1849 in Glamorganshire, and her parents were Thomas Johns & Catherine (nee Davis). They seem to have had strong connections to the Llantrisant/Pentyrch area of Glamorgan. Their eldest daughter Catherine was baptised in May 1851, ie. just a few months after the census, at Llantrisant. Then their son John was baptised at nearby Pentyrch on 11 Aug 1852-- their abode at that point was stated as Llwyn-y-brain-bach (a house between the villages of Pentych and Llantrissant). Much later in 1872 their daughter Catherine, who seems to have stayed behind in Wales, was married at Llantrisant.
I've search the 1851 census record for Llwyn-y-brain-bach-- but it shows a different family living there.
Am I missing something? How reliable are the census records? Or perhaps they were not in the same dwelling on census night for some reason.