Quarteen Baxton shows a photograph of a man to a friend and says, “Brothers and sisters have I none, but this man’s father is my father’s son.” What relation is Baxton to the man in the photo?
Baxton has no brothers or sisters, so “my father’s son” must be Baxton himself. Therefore, “this man’s father” — “this man” being the man in the photo — is “my father’s son,” that is, Baxton himself. So the photo is a picture of Baxton’s son.