I concur TB. However, I definitely think that his "I'm with you now, Pop," was just father to son. It was Micahel's way of letting his father know that his years of estrangment from him was over. I don't think he was throwing in his lot with Vito's crime family.
"Generosity. That was my first mistake." "Experience must be our only guide; reason may mislead us." "Instagram is Twitter for people who can't read."
