I'm also descended from two Smylie lines from Belfast - Alice Smylie married William Smylie in 1907. The lines go like this: William D Smylie born 13 Dec 1882 Belfast, occupation poulterer. Father David Smylie (born around 1860) and Ann Jane McDade. Grandfather: Joseph Smylie born abt 1840s
Alice Mary Smylie born 28 Dec 1885 father - William Smylie born 1842, lithographer mother - Jane Miller born abt 1840 married 4 oct 1862 belfast grandfather - John Smylie born abt 1820 occupation weaver grandfather - John Miller born abt 1820 occupation sailor
I have more info on the siblings and descendants too of the parents.