I was hoping to edit my post above, given it was posted in 2019 and the information is not correct! Obviously, since then I came across further information.
Mary McTiernan was James Millar's first wife, they had two children together, Martha born 18/10 /1899, James 09/05 /1903.
James wife passed away and sometime after he married Elizabeth McClean, they had one child together, Robert.