Hi there freehily,
Was just reading your posts and if your parent was baptised in St. Mary's the information your looking for might be in St. Patricks Guild, 203 merrion Road. They are holding the files. You must write to them enclosing your parent's birth Cert/Bap cert(photocopy) addressed to ;Sister Francers Fahy. It takes between6/7 weeks for an appointment. They will appoint a social worker aswell.
They will give you the information that's held in the file but it doesn't contain any medical information.
They won't see you without an appointment-Hope this helps-let me know how you get on. My mother was born in 1943 in 33 Percy Place and baptised in St. Mary's, Haddington Rd. The Sponsor Kathleen Dalton was a sponsor to a lot of babies at that time.
Good luck. Natasha.