CARL HAD THE ANSWER (DOESN'T HE ALWAYS?)

He knew who the two old geezers with the geyser, in-between, were.  He said, "It's probably been a long time since you saw Rick (on the left) and you know his dad (on the right)."

Well, now, I figured it had something to do with Rita and Roger but I was thinking the one on the left looked too old for Rick and the one on the right looked too young for Roger so don't count on me to pick out the bad guy in a line-up.