In Future Imperfect (?), Riker's "son" is named Jean Luc, but he's actually the alien in the meme. He has holo projectors or something and basically wants company and makes up this whole future scenario where he's Riker's son on the Enterprise and Riker is captain.
It's one where Riker wakes up apparently with amnesia after an accident, several years after the "present". Riker married a woman called Min and had a son, whom they called Jean-Luc. Several weird things happened, but the main clue was >!seeing a family photo with Min and Jean-Luc. "Min" is Minuet, the holographic character created by the Bynars when they took the Enterprise in Season 1. So Riker deduced that all was some kind of simulation.!<