John William Millen (Millens of South Africa)

I am trying to trace the family history of the Millen family in South Africa.

The three living Millens are John Millen, Henry Millen and Sufreen Millen - all around age 70 - 74

The only information we have is that their father's name was Johannes Joshua Millen (Born in South Africa hence the names) and their great grandfather was John William Millen (whom we believe originally came from Scotland, but this may not be correct)- and this is where we run out of information

Anyone have information regarding - would love to hear from you.

Kind regards

Cliff