Yes, that would make sense. I looked up Mary Davies on the 1871 and 1881 census. On the 1871 census, one Sarah Jones, aged 20, her granddaughter was with her. I wondered if it would be possible for you to check the 1861 census for Henry + Susannah and family, to see if she's listed there as a daughter? It seemed like there was a big gap between John Hill (1848) and William (1855). If not, I understand, and I greatly appreciate the help you've given me - there's no way I could've found out all that from here!
