I didn't get what I was looking at until Yoda's post.
Looks about as legit as anything tbh. That's clearly both Jones people looking the age I'd expect them to look in what I would assume in 1978, and it confirms the existence of a non-familial member of the band, that Ron Neary guy who was apparently in some band called LA Hooker a few years later. Good stuff, you may now consider the case closed.