By peoplestaff225
Updated October 15, 2008 06:30 PM

Jim Spellman/WireImage

The friendship between actors Josh Brolin and Javier Bardem — which first formed during the shooting of No Country for Old Men — has paid off in spades, for Josh’s two children Trevor, 20 and Eden, 15. During a Tuesday appearance on the Late Show with David Letterman, Josh revealed that the kids recently completed a train and backpacking tour of Europe; the first stop on their trip was Amsterdam, necessitating a father-son chat about drugs. "I looked at my son and said ‘Alright, do you hear me?" the 40-year-old actor said while jokingly simulating someone smoking pot, to which Trevor reportedly replied "I hear ya, loud and clear man!’" When brother and sister found their funds running low, they called their dad — who in turn called Javier in Spain.

Trevor and Eden are Josh’s children with ex-wife Alice Adair. He is also step-father to Eleanor Jasmine, 15, with wife Diane Lane. Josh’s latest film, W, is in theaters Friday.