Brian Austin Green is opening up about what it's like raising kids when you're famous.While speaking with Soleil Moon Frye for ET this week, the 47-year-old actor spoke about the possibility of his children wanting to follow in his footsteps one day, and if he'd let them. Green shares three kids -- Noah, 8, Bodhi, 7, and Journey, 4 -- with ex Megan Fox. He also shares an 18-year-old son, Kassius, with Vanessa Marcil. «I'm not sure how [to protect them], to be honest.