It is confusing with common names isn't it! There seem to be birth references around, but connecting to censuses is hard.
Searching their eldest children Robert (1865) and my g-grandfather Jeremiah (1867) I've not been able to find any trace of them or their parents together in the 1871 census, so assumed either there are documents missing or the family were somehow missed out. The property in 1881 was a rented rather ramshackle cottage in Minera, which suggests they moved around before settling in Coedpoeth by 1891. I highly doubt they went overseas, Jeremiah is remembered by living relations, such a fact would surely be known in the family.
I noticed there is an 1834 Halkyn born (aged 27) Robert in the 1861 census, with 26 year old wife Hannah (from Corwen) and a 1 week old baby son Meredith, but again the age difference between parents doesn't match - I think that's a strong clue with any census record - Hannah was eight years younger than Robert, not the 1 year as shown here. Also I'm not convinced by the Halkyn birth.
One interesting thing (though I don't know if this helps) - widowed Hannah’s entry in the 1911 census in Smelt Road, Coedpoeth mentions she had 14 children, five surviving and no less than nine no longer alive. I have traced all the ‘living’ ones, but the only pre-1911 death I know is her daughter Rebecca who died aged 21 in 1908. So if the family are listed in the 1871 census they may have an entirely different set of soon-to-be-deceased children.
