Thanks for the reply.
Yes we are related. Your father would have been the first cousin of my grandmother, Ivy Squair. I think that means we are 4th cousins.
Ivy was the daughter of Francis Squair and married my grandfather Cecil Taylor. They also lived in Wimbledon and were keen tennis players. They actually met through their local tennis club.
About 3 years ago we travelled to Auldearn in Scotland which was the birthplace of James Mein Squair. We found the farm where the family lived and also the headstones of other members of the Squair family. According to my research James was the youngest of 11 (yes ELEVEN) children.