I just saw the movie Music Within Music Within (2007) - IMDb
The opening credits said it starred Michael Sheen and the lead actor was a guy who looked extremely like a younger version of Charlie Sheen. So, I assumed that was his son.
But, I had it wrong. The lead actor was Ron Livingston and I’ll be damned if he is not the spitting image of a younger Charlie Sheen.
It’s a true story and an excellent movie. I recommend it to everyone.