Sebastian Miranda is fully bilingual in English and Spanish, and is on his way to learning a third language, his dad Lin-Manuel Miranda tells PEOPLE

By Alexia Fernandez
November 22, 2016 04:25 PM

Lin-Manuel Miranda is a force among Broadway and Hollywood creatives, but it’s his son who might just give him a run for his awards.

Sebastian, 2, is fully bilingual in English and Spanish — and is on his way to learning a third language, Miranda tells PEOPLE.

“It’s adorable to see him sense who he’s talking to and translate,” says Miranda, 36. “He’ll be like, ‘Leche?’ No, Milk?’ and that’s kind of incredible. He’s like a sponge and he’s got a smattering of German, too. My mother-in-law is Austrian, so he’s got one language up on me.”

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The Tony award winner, who is of Puerto Rican descent, says he’s happy to be spending more time with his son after spending the first year of Sebastian’s life performing in his hit musical Hamilton every night.

“The fun is having my nights back, getting to tuck my kid in,” he says. “Now, my days consist of singing and dancing with Emily Blunt all day [while filming Mary Poppins Returns], and then I tuck my kid in at the end of the night — and that’s pretty rad.”

The new routine for father and son has allowed them to bond more, with Miranda reading to his baby boy before bedtime.

“There’s a bedtime song routine,” he says, smiling. “You’re always a little nervous to read Go Dog Go because it hypes them up more than it calms them down. It ends with a dog party in a tree!”

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It turns out the nighttime ritual, whose duties he shares with wife Vanessa, has also sparked some more original compositions from the composer dedicated solely for his boy.

“We’ve got a few original compositions in the mix,” says Miranda, who penned music for Disney’s upcoming film Moana, out Friday. “There’s a goodnight song that I invented that involves the names of every single person he knows – we have to now get through that before he falls asleep, and the list is growing so the song gets longer.”

RELATED VIDEO: ‘Hamilton’ Star Lin-Manuel Miranda Pays Tribute to David Bowie With ‘Moana’ Song ‘Shiny’

Aside from traveling the world, rehearsing for Mary Poppins Returns and overseeing preparations for the West End production of Hamilton, Miranda still enjoys the simple things in life, like “vegging out” with his son and “watching him pick up stuff.”

“We’re now at the point where you have to be really careful with what you say,” the recent Saturday Night Live host says about his son’s language skills. “He was climbing steps the other day and he was like, ‘Oh my God, oh my God.’ I was like, ‘Oh, okay, I gotta really chill with that one.’ We’re in a really fun language place right now.”

For more from Lin-Manuel Miranda, pick up the latest issue of PEOPLE, on newsstands Friday.

  • With reporting by KARA WARNER