Brad Pitt's family make him feel like the ''richest man alive''.

The 50-year-old actor - who raises six kids, Maddox, 13, Pax, 10, Zahara, nine, Shiloh, eight, and six-year-old twins Knox and Vivienne, with wife Angelina Jolie - admits becoming a parent changed him completely and he loves helping his children grow up.

He told Psychologies magazine: ''You learn to value the basic beauty of family, of watching your children grow and evolve. It's the most beautiful thing you can experience.

''Being a father has changed me on so many levels and made me more generous and alive.''

He added: ''I see my children as an essential part of my life, and it means so much to be able to educate them and help them make their way in the world as they grow up.

''I love being a father and all the responsibilities that entails. I feel like the richest man alive since I've become a father.''

And the 'Fury' star admits he never stops worrying about his family and will always put them first.

He said: ''I worry about them all the time. That's the emotional bond and responsibility that sweeps over you when you have a family to look after.

''I care about them more than I care about myself, which I think is the real definition of love. You see past yourself and become more generous and giving, and wanting only the best for your family.''