But despite name-dropping his famous dad, John shared that Billy takes every opportunity he can to poke fun at his acting career.

“He watches Full House, but he watches it to mock me,” John admitted. “Because I’ll be like, ‘Go put your Legos away.’”

Then Billy will respond with Michelle Tanner’s famous line, “You got it, dude.”

“He’s pulling catchphrases on me,” John laughed, adding that he’s even used Uncle Jesse’s “have mercy” quote. “But mocking. Not like it’s cool or anything.”

Billy has also taken to critiquing his dad’s performances, which John confessed is both “inspiring and it’s annoying.”

“I’m doing Nightmare Before Christmas at the Hollywood Bowl,” John shared, “and I was just trying to learn lyrics. He says, ‘Dad, put an image with it.’ I said, ‘Shut up.’”

Jokes aside, Billyalso had notes for John’s acting choices as he takes on the role of Lock, which was made famous by Paul Reubens in the 1993 cartoon.

“We were singing last night in the car, and he said, ‘You’re gonna do a different voice, right?’” John recalled. “’You’re gonna do a higher, kind of more of a charactery voice?’”

Still, having kids later in life was especially meaningful not just for John, but also for former Guns N’ Roses drummer Matt Sorum, who passed the torch to the John this year to help provide students at Los Angeles’ Rosewood STEM Magnet Elementary School with a music education through the Adopt the Arts Foundation in partnership with Five for Fighting‘s John Ondrasik and his Let Music Fill My World charity.

“We have kids later in life—it’s just a different experience as far as what we think,” Matt, 64, shared with E!. “When we wake up, the first thing we wake up to is our kid. And it’s just on. It’s not like the old days we’d sleep in a little later.”

And most importantly for John, being a dad has let him find new ways to connect with Billy, which the Beach Boys drummer said he’s been excited to do through music.

“He loves coming to The Beach Boys shows,” John shared, “and he loves running on stage. I told him, ‘You gotta learn the tambourine part on “Good Vibrations” if you wanna stand up there and play.’” 

And Billy has taken his task very seriously, even taking drum lessons. But while his son has access to those things, John knows that many kids that don’t have that luxury, which is why he’s so excited to work with Adopt the Arts.

“Some of these schools,” he said, “these kids don’t have music.”

Which is why John believes Adopt the Arts is so life-changing, because they don’t just drop off instruments, but instead make sure that the music activities are still ongoing and that there’s a musical curriculum in place. 

“I’m grateful to be part of it,” John gushed, adding that he’s most excited to visit and jam with the kids. “At the end of the day, that’s why I really do this thing.”

Keep reading for more adorable moments between John and Billy.