Hi Linda,
I recently spotted that Blackmore family in Galway in the 1901 census when I was looking for possible relatives of my wife's great-great-grandfather, John Blackmore (c1846-1900).
This John was also a plumber (same as Thomas) and lived in Ennis, Co. Clare from the 1870's to his death. He died before the 1901 census so I didn't know where he was born originally.
His marriage cert in 1871 lists William Blackmore, an "engineer", as his father.
I noticed another Blackmore family close by in Galway (St Patrick's Ave), with the head William and his mother, Elizabeth (widowed), both born in England (as was Thomas).
I found a death cert for a William Blackmore of the same address who died in 1900 aged "80" and was an engine driver, same as the younger William.
I'm thinking that Thomas and William were my wife's ancestor John's brothers, and the older William and Elizabeth were his parents, all from England.
Do you know anymore about the Blackmores in Galway, and whether they had any relatives in Ennis? I found another Blackmore engine driver from England living in Meath in 1901 too, possibly another brother?
Thanks, Dave