The Karate Kid ,,,, but in a London Gangster setting
.... and guns added to the kung fu.
Not quite but the kid does look like Jaden Smith a bit, and wouldn't be surprised if he got into martial arts after seeing Jaden in Karate Kid in a 'he's skinny and looks like me and can do that then maybe I can too' way
A good father and a good outlaw can't settle inside the same man.