Most of us have photographs taken before we were born that we can identify the people in. Of course, some of that identification will be because we've only seen pictures of those people before.
I identified the people in this picture, even though two of them I never met.
The two boys in the front are Roger Neill (standing) and Pat Neill (being held). My father is in the background being held by his mother, Ida (Trautvetter) Neill. Fannie (Rampley) Neill is sitting on the porch and Charlie Neill is standing holding Pat. The three boys are grandsons of Charlie and Fannie--Ida is their daughter-in-law.
I recognize my grandmother from knowing her and having seen other pictures. Charlie and Fannie I recognize from having seen other pictures. The fact that I can see my own father in Charlie's face isn't proof, but it was an interesting thing for me to note.
"Looks like a relative" is not adequate for identification.
It pays to proofread: As soon as I posted this image, I realized I left off the state in which the picture was taken. To me the state was obvious, but obviously that will not be obvious to others.