The Camera Couple and The Third Wheel

I do love my photographs of photographers.  I've just gone through one of my favorite reference books, 500 Cameras, 170 Years of Photographic Innovation by Todd Gustavson and the closest match I can find to the lady's camera is a No. 4 Screen Focus Kodak, Model A, first made in 1904.  Of course, once a company made a nice camera, it wasn't long until another company came up with a copy.  And the man's camera, a bit difficult to see down there between his legs, looks like it might be a Kodak Autographic first made in 1916.  I have one in my collection and a number of others that look pretty much the same.  Oh well.  Now, is the third person their model, or just the guy that they couldn't ditch before heading out on a camera outing?  Maybe his camera is on a tripod with a self timer.  Either that, or there's a forth person and with luck the third man's date.