The Tycoons - S5-E23
Revealing mistake: After Roy and Johnny get to the hospital with the 18 month old baby who stopped breathing, when Johnny is rushing up the hallway giving mouth-to-mouth to the baby, we can see that the happy little baby is wide awake and even smiling.
Answer: I believe you are speaking of the old man, Mr. Wilson. He's played by J. Pat O'Malley.
Bishop73
Correct, it was J. Pat O'Malley...he also played the grandfather with his grandson when their rocket exploded, and also played "Old Bill" in the episode with Ann Prentiss, where Gage saves the little girl from the burning tree house, and her mother falls in love with him.