The actor, whose eight-year-old daughter Lily-Rose was hospitalized after reportedly contracting the E.coli bacterial infection earlier this year, insists nothing matters more to him than his family.
Johnny, who also has a five-year-old son Jack John with long-term partner Vanessa Paradis, said: "I wasn't sure if I would be able to come back. My kids and my girl - nothing else matters in life. My kids are very grounded, not monster-like at all. We keep discipline under control.
"When I was younger I used to play a lot of practical jokes and I p****d my mother off. But the greatest advice I ever got was from her, 'Don't take s**t from anybody. Ever.' And that has stuck with me and I hope my kids never, ever have to take s**t off anybody either."