No, there were no Barrs in the family. In any case, my mother knew next to nothing about her dad's family. Her father, Malcolm McDonald, died at age 39 in 1920, a few months after returning from WWI. Her mother (Edith Kelty) remarried a couple of months afterwards, and any reference to her first husband was forbidden. Hence my mother had no real famiy connections on her father's side. A great pity, as there were a number of interesting people in that McDonald lineage.
They contributed a great deal to building up the Glengarry area.
If you're able to find anything further about George and/or his siblings, I'd be extremely grateful.