You mention on the other list the probate says Donald left nothing to sister in NZ (Alexandrina)
Did her marriage cert confirm parents..just wondering considering there others by that name..married and single
In 1919 Roll there are also other DOnalds in that area
eg at Waiaraki, farmer at Wallace Electorate
What electorate did you find the Nightcaps based Donald Mackay? I can't seem to spot it
Just thought if we try and track back from there once I find your reference
The Directories can then also be checked..they may give some more exact info/address
Bye
Althea