I have a John Stobbart born in March 1842, but his wife was an Ellen or Ellenor Robinson. They apparently had a son named John George Stobbart who was born in 1867, according to someone else's tree. Search on that name and 1867 and you'll find a few public trees with this John George Stobbart. I don't know if he's your John George Stobbart as the wife's name is different. What I've found is that so many women died in child birth that it's quite frequent to see second and third wives, so perhaps that may explain the "Catherine Mary Cairns" you have.