Celebrity Parents See Jessica Biel, Justin Timberlake Take Sons Trick-or-Treating in Harry Potter Halloween Costumes Jessica Biel and Justin Timberlake are parents to sons Phineas, 15 months, and Silas, 6½ By Georgia Slater Georgia Slater Twitter Georgia Slater is a writer/reporter on the Parents team at PEOPLE. People Editorial Guidelines Published on November 1, 2021 03:45 PM Share Tweet Pin Email Photo: Jessica Biel/Instagram; Inset: Rodin Eckenroth/Getty Jessica Biel and Justin Timberlake made sure their kids had a magical Halloween! On Sunday, the couple and their two sons, Phineas, 15 months, and Silas, 6½, dressed up as various characters from Harry Potter to go trick-or-treating as a family. Biel, 39, shared a series of photos from the holiday to Instagram, featuring the actress dressed as Professor McGonagall, Timberlake, 40, as Dumbledore, Silas as Harry Potter and baby Phineas as Hedwig, Harry Potter's pet owl. "Last night at MAGIC hour ✨🧙🏻♀️," Biel writes. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. L: Caption . PHOTO: Jessica Biel/Instagram R: Caption . PHOTO: Jessica Biel/Instagram RELATED GALLERY: See All of the Celebrity Kid Halloween Costumes of 2021 In September, Biel appeared on an episode of Today with Hoda and Jenna where she discussed life at home with her two sons and her experience with taking care of a baby for the second time. Asked by Kotb if she experienced a "relearning process" when it came to baby No. 2, Biel replied without hesitation, "Oh yes." "I remember going, 'When does he eat real food? What kind of cream? What bathtub?' I felt like I forgot — it was amnesia," she explained. "I started from scratch all over again, and I didn't expect that. I just sort of thought, 'Well, I'm an expert now. You know, I've done this before, and I can do it again.' No, I needed a full education all over again." Biel also shared new details about the relationship between her two sons, including that Silas thinks his little brother Phineas is "hilarious." "He finds him really funny, and the baby thinks that Silas has hung the moon. So, that's really cute," she added. "He, of course, wants to do everything that his older brother's doing and follows him around everywhere. But Silas is the best big brother. He's so sweet, and he's just a lovely guy. We're pretty lucky. They're sweet boys."