John met his sons, Sam and Dean, already after he came back from dead.

John was standing in front of Sam, looking at him with glassy eyes “I really screwed it up with you, didn’t I?” John said hoarsely as he hesitantly reached out his hand

He apologised to Dean and Sam for being an awful dad, or more like not even being a dad. But it seemed like he forgot that he had one more child that deserved apologies. One more who he hurt and basically abused. The youngest. You.