Just concentrate on the top text and image. He's telling us that the two children are himself and a little boy he names David...and it's 1968. 
Now we have two children he once again describes as himself and David, and it's now 1971, there years later.
NO WAY! No way can anyone help you identify any of the children on the pages you posted. I doubt if you would find anyone who would try...unless they understood just what Mark is up to and why.