Hi, DavePPP, and welcome to rootschat.
Hope Patrick survived the treatment from Nazareth House, and possibly is still living in Australia.
If he is still alive he should not show on family trees, so have you looked to see if your uncle is in trees on Ancestry, and then tried to contact tree owners to see what information they may have on him?
Was he born in Aberdeen?
When you put "Patrick Doogan" - was that his actual name, or are you deliberately keeping it hidden as he may be alive? Have you got his actual birth information?