Hi
I realise that this is an old thread, but Arthur Cecil Coulson was my 2nd Great-grandfather. I am related to him through his first wife, Thirza Ayr Coulson née Steele. Their daughter, Ellen was my nan's mother. She died in 1933 when my Great -Uncle John was born. There was another child, my Great-Aunt Peggy. Out of them Uncle John is the only one left.
From what I understand - and this might just be something that was told to my nan and there might be some inaccuracies - During the war something happened and he ended up in Canada. Now I've been told he'd lost his memory, but not sure if that was said to save face as it were, because whilst he was still married to Thirza, he married a Canadian woman, followed by marrying another.
He never returned to the UK, and understandably Thirza never talked about him with my nan or her siblings.