He did have a son when he left the series so maybe he did.
The charater of Adam was approximately 25 to 28 years old.
The writers said that Adam Cartwright went off to sea in a ship to explore.
There was no specific episode where he left. It was left up in the air, leaving open the opportunity for actor Pernell Roberts to return if he wanted. Roberts left after the sixth season with the...
Nobody could really replace the character Adam. But they filled the big hole Pernell Roberts left by the new character Candy.