Well, I must admit I am not very up to speed with whose who and what links there might have been by the 1960s. My forays into researching tends to be focussed on much earlier periods of time than that, I find this keeps me busy enough.
There seems to have been links forged between the Conroys, Millers, Drummonds, and Anderson/Allens in the Northumberland area, particularly around Morpeth between the 1840's to 1870s.
I have found that there is a grave stone at St Albans, Earsdon which has an inscription for, Michael, Sarah, Jacob and wife Jane Miller nee Anderson. There are some Campbells named too. I do not know how/why they came to be named/buried in this Miller grave. I think that is what so tantalising, sometimes frustrating about family history research is that the question very often outweigh the answers.
Anyway, I digress - if you have the names of the wives of all four Adam Drummond, could you let me know if there were two Ann Conroys amongst them?