Any Info Re James Maxwell Born C 1840 Ish Married Mary Lloyd

These were my great grandparents. I know James was a joiner to trade and had died by 1894. They had a son Patrick who was born in Enniskillen Fermanagh Ireland c1869/1871. I can't identify James or Mary on any UK census, nor can if find where they were born or married. By 1890 Patrick had moved to Glasgow Scotland and I've lots of info on him from then on. Anyone know of any siblings for James, Mary or Patrick ? Thanks