Mystery Picture

Who are these people? Where and when was the picture taken? The picture comes from the W.G. and M.A. Hewlett collection. It is obviously a picture of a tailor's workshop; but, since both the Hewletts and Parkins were tailors, it is not easy to know which side of the family this came from. Is the man on the left John Parkin, Melia's father? Or is the picture from even further back in the Parkin or Hewlett families?