Joey Travolta
Joey Travolta should have been in the siblings group also. The scene could have went something like this:
Joey Travolta: I know how you feel, Frank. When my brother John became big, what could I do? I tried to have a singing career but it was always "Yeah, he's trying to ride on his brother's coat-tails."
Frank Stallone: Sure, I had the same problem. At least my brother Sly let me have a song on his film Staying Alive.
Joey: Hey, my brother was in that same film! Why did you get a song and not me??
Frank: John and Sly flipped a coin - your brother lost.
Joey: Che bella fratello ho! Che palle!!
Frank: Mi fa cagare!