Miranda and Nadal's first child, a son named Sebastian, was born on 10 Nov., 2014. Miranda announced his son's birth on Twitter with a photo of the newborn and the very-fitting-for-a-playwright caption: "[The screams reach a frenzied pitch. SEBASTIAN MIRANDA enters. He is 7 pounds 10 ounces.]" So adorable!
Sebastian seems to be a budding filmmaker and actor, according to Miranda, who shared in a tweet in May 2020 that every weekend, he acts as cinematographer for his son's movies. "And while I can't show you clips because he and his brother are the stars, I have permission to post this exclusive pic of my brother-in-law Tristan as an elephant," he wrote alongside a photo of Tristan in a handmade elephant mask.
In September 2020, Miranda celebrated Sebastian's first lost tooth and turned to his followers to ask the going rate for the Tooth Fairy these days — $1 for a first tooth, according to a Twitter poll. "BREAKING: We got a first lost tooth here, I repeat, the five year old lost a tooth, pretty sure it is ALSO the first tooth he ever got," Miranda wrote, adding in another tweet: "The five year old BOUNDED in at 1am with a crisp bill covered in a magical glitter only known to tooth fairies and pharmacies open late on Tuesday evenings. Also included: a receipt of sale filled out in a cursive that looks NOTHING like [Vanessa]'s handwriting. Thank you all."
A fun fact about Sebastian's name: Miranda told The New York Times in 2015 that part of the reason he liked the name Sebastian is because of the character in "The Little Mermaid," making his involvement in the live-action adaptation of Ariel's story particularly fitting.