There isn't an episode where dean meets his son there is an episode where he belives that a kid he meets is his son but the mother tells him at the end that it was another mans son. but that episode is season 3 episode 2 and its called the kids are alright.
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"Lazarus Rising" it's the first episode of season four. Sam and Dean meet Cas for the first time.
No, Castiel from Supernatural does not have a son.
The episode is Bart Carny and they meet Cooder and Spud at the carnival.
Season Three Episode One "Lost Son"
The Good Son
He was his son