Hi I think I may be of help here. My grandfather was Thomas Costello and he married (2nd time) Mary Ann Ryan (married 28-Jun-1915, Hollyford) they were both from the village of Raefadda. His first wife was Brigdet Hayes. My father was from the first family, he was much older than my mother and died in 1974 aged 73. My understanding is that Thomas Costello and Mary Ann Ryan moved to Greenan Mor in Rathdrum, Co Wicklow after their marriage, and had a number of children of whom one daughter - Lucy and one son - Matt remain alive today.
I hope this is of help.
Polly