SPOILER Potential!
I remember this guy, and it's not the scenario that I remember with Jesse.Thanks. Hmm...I don't remember a bearded man, but I remember a scene with Jesse walking around the beach naked, not knowing what happened to him. I don't remember an attempt at hybridization not working on him, though.
The son, Jesse, is not a hybrid. His uncle, Dave, who has wild hair and a beard, is one who went in the water and had brief contact with a "creature." In a later episode, his "double" -- deformed and pitiable -- was a key feature, and died...but Dave (brother-in-law of Eddie Cibrian who plays Russell -- married to Dave's sister, Larkin) is completely human.
Jesse has never had an alien encounter in the water.
One boy, however...Derek, a friend of Kira (human), daughter of the Sheriff, Tom (who is a hybrid)...was at a party in the second or third episode. He was drunk and rambunctious. He went into the water. He was later found naked on the beach...and had become a hybrid.
Derek was later sent by the Sheriff to a training camp. He escaped with a dangerous female hybrid named Christina. They mated, she became pregnant and they were both apprehended the Sheriff and returned to the camp Tom set up for hybrids on a small island. Both were shot/killed about three weeks back by a man named Zura who has betrayed the Sheriff and is planning to wipe out humans in the town of Homestead.