Simon Prince Family

Simon and Vina McCauley Prince and their children, plus a couple of unknown boys.  Identified children are : Ora Ann, Oscar, Maggie, Olivia, Doyal, and Herman.  Recent information says the boy in front of Maggie may be Arthur.  There are 7 boys in the photo, but they only had 5 boys.  Which boy is Henry Prince, and who are the extra 2 boys?