John,
When I enquired about my great aunt who was adopted, I was given the following to contact:
The archivist, st joseph's, Tivoli road, dun Laoghaire, Dublin, Ireland.
Also for fostering / adoption: Tusla child and family agency, information and teaching service, 2nd floor, units 4/5 nexus building, banchardstown, corporate park, ballycoolin, Dublin 15, Ireland.
If they can't help, they may be able to point you in the direction of others who can, maybe?
Best of luck in your search.