Having had tremendous help tracing the daughter, I wonder if anyone could wave magic wand over the fate of her father? Alexander Fleming Richmond (born 1874 in Montrose Scotland). He moved to Canada and was in the Expeditionary force. He married, had 2 children. Wife died, kids went in to care. The last record I have for him is a possible border crossing from Canada to US, aged 47, saying he is going to live with his brother in New York. Trail goes cold. No death for him that I can find.
Any help very welcome