Jeannie
If you have not already done so you may care to write to the parish priest in Athy and ask him to look up the children in the handwritten Baptismal register. This register gives the names of the sponsors who stood for the children at their Baptisms. Sponsors were often brothers and sisters of the parents which could lead you to other members of the clan.
You could also ask the priest if there were any other children of the family.
I have updated my pedigree sheet for this family with the additional details you have given and if I get any enquiries I shall pass them on to you.
Regards
Michael