Colin Farrell says his son is an ''absolute stud''.

The 37-year-old actor's son James, 10, suffers from Angelman Syndrome - a rare genetic condition that can impair speech, movement and balance - but he insists he is making incredible progress and makes him proud every day.

He told People magazine: ''Every day, just breaking down boundaries. He's an amazing boy.''

The 'Winter's Tale' star previously admitted James - whom he has with ex-girlfriend Kim Bordenave - was one of the main reasons he checked himself into rehab for drug and alcohol abuse in 2005.

He said last year: ''Everything he's achieved in his life has come through the presence and the kind of will that is hard work. He's a lot to be inspired by.

''Things like walking and talking and eating and feeding himself, all those things that so many of us naturally take for granted because they come so easily, to James, they come somewhat harder ... I remember the days when he couldn't watch 10 minutes of a film because he couldn't sit still, but now he can.''

Meanwhile, Colin recently admitted James is still trying to bond with his half-brother, four-year-old Henry - whom the star has with Alicja Bachleda - but insists they're getting better as they get older.

He said previously: ''They have two different moms so their crossover time isn't a lot ... so they're figuring it out.

''They're good together. They're funny together. They're finally getting used to the idea that the other one isn't leaving anytime soon, that they're both here to stay.''