Hi , My GGG grandmother was Mary Duffin, b c 1817 in Antrim(not sure exactly where). She married john McDonnell( b c1809) in St Mary's RC church Glenravel, I think around 1842. They had around 9 children ranging from Margaret b c 1843, Eanos, b c1845, Hugh b c 1847, John b c1849,ann b c1851, Randle b c1853, Mary b c1855 ,all born in Ireland and Sarah b c1857 , Alexander bc 1861 , in Glasgow. So they must have moved from Antrim to Glasgow between 1855 and 1857.
On 1851 census, found family living in Dunaghy (Antrim), town Lisnamanny. Father John was a farmer. Would any of this fall into your family tree. ?