Never mess up with mama's boyfriend, or you'll feel like shit when you see his daughter. Mia should've slapped back. But it's just too hard for her to handle the whole thing in such a sudden. She, like the 16-yr-old horse, might be dead.
I would rather say it's a sentimental film than a good one. Brian Wilson is brilliantly portrayed by Paul Dano and John Cusack but sadly the two periods of time are not coherent. Personally I think when people get older they tend to appreciate the beach boys better.