If you don't already have answers I may be able to help.He was my father. He had brothers and sisters. His father's name was James/Gaelic Seamus. He did not live in Millport, although we had a holiday house there, but mainly in Glasgow. There is a book about him: 'Wise enough to play the fool' by Priscilla Barlow, now out of print but obtainable through dealers - Abe Books, Amazon.
If you let me know who you are and what you want to know I may be able to help further.