I have been working on McCreath Family History for some years. I have traced my branch back to the Maybole area to c.1685. There are other branches which so far I have been unable to tie in - including your branch. I believe your Grace Kirkpatrick was the wife of Matthew McCreath (b. 8 Sep 1907; d 23 Nov 1936) His father was Matthew McCrindle McCreath (b21 Aug 1883) and his father a James McCreath. Does this seem right?