Hi Lynn
I got hold of William McGill Blair's mother and this is her reply:
Robert Blair who came from Scotland and worked on the mines had 4 sons.
There were 4 sons:
William, Douglas, Robert and James.
Douglas was killed in the second world war in Toebrouk Africa. He was in the airforce.
Douglas apparently had 2 daughters.
Robert who came to South Africa had one son whom he named William McGIll Blair. Robert married a lady named Margaret Barbara Lesley.
RObert himself was a mining engineer for Anglo America and invented a lot of mining infrastructure which is still in use today.
His son William became a mine manager and with his first long leave cheque he started his own business called Emdeen which was later British General Electric company. He passed away on 31 December 1989. He was married to Joy Deeble, They had 4 kids called John, Michael, William and Margaret.
John married Ross and they have 2 kids Jemma and James. Michael Married Nichola and they also have 2 kids, Gabriella and Murray.
Margaret is still single and such is the case with William.
James, on the other hand had 2 children, a boy called Robert and a girl called Janette. We do not know much else about them.
I am sure if this is the McGill Blair's you are looking for, that they would love to get into contact with their American relatives.
Regards
Polie