Jim,
The fathers of John and Elizabeth were Thomas Kane and James O'Donnell. There were too many John Kanes whose father was Thomas to do any speculation. Howeverthere were only two Elizabeth O'Donnels whose father was James, one born in 1834 and one in 1887. I have found a marriage of a James O'Donnell to Mary McLean on 10 Apr 1887 in Belfast (Urban 6) R.C.Church which looks interesting.
If you want details of the sites I will send them by the Personal Message system.
Regards