Hi Cathy,
There's a headstone that names John Colquhoun son of Maggie Brown & Archibald B. Colquhoun who died at Arras, 7th of April 1917 in New Kilpatrick Cemetery in Bearsden. Its also the resting place of John's sister Margaret B. Colquhoun. Spanner in the works is the father died in 1952.
Its a strange coincidence the name, year of death and place of death is the same, but father and sister definitely didn't die in 1919. I take it this is not the same John Colquhoun?
Chris