Perhaps this Henry Drain relates to the Henry Drain that I have been researching. His son, James Drain, emigrated to Gateshead, County Durham where he married Elizabeth Duffin in 1877. Both James and Elizabeth are listed in the marriage record and census as being from Ireland. Moreover, Elizbeth Duffin was the daughter of James Duffin and Phebe McGuffin, who were married in 1845 in Londonderry. It's not clear if Henry also emigrated, nor do I know his wife's name. He was born about 1816, so perhaps he is the Mill Quarter Henry Drain. If this registers with anyone, please let me know.