William john Cochrane

My paternal grandfather was born on the 27th Dec 1877 in Feeny, bannagher parish ,he left Ireland when I dont know but married my grandmother in 1915 in Glasgow. His parents were William john cochrane and Mary Montgomery, they married on 11th feb 1868 in bannagher Presbyterian Church, his dad was William cochrane and her dad was Joseph Montgomery, im trying to find their birth dates for my great grandparents and gg grandparents.
Thank you
Alan Cochrane