I don't know what I would have done, luckily I didn't have to do anything.
I don't think S told his dad to leave because he was afraid, I think S just wanted to be left alone. H was fooling with him and my S does say stuff like this when he gets mad, S is mouthy so it's not the first time I've heard S say this.
As an example, a while ago S was doing something he wasn't supposed to and H made him stand in the corner and S didn't want to stand in the corner. S is standing there mouthing back to his dad and at one point S said "you know what Dad if you don't let me out of this corner, I won't be your friend anymore" and H still wouldn't let him get out of the corner so S turns around again and says "fine then you're not my dad anymore" so this is normal conversation. My S stands up to his dad, at the age of 4, so I DO worry what is going to happen down the road as they both have the same temperment.
