Zac bonds with his brother Dylan Efron on a late summer 2023 trip.
Zac Efron posted this adorable photo of him reading a book to little sister Olivia in February 2023, writing on Instagram, "My valentine."
In a June 2021 Instagram post, Zac called Olivia a "little heartbreaker."
Zac took Olivia and his youngest brother, Henry, to the circus in June 2023.
The High School Musical alum visited Circus Vargas with his siblings and dad David Efron.
Zac and his younger brother Dylan cuddled some baby goats in June 2018.
The older Efron brothers checked out a Los Angeles Dodgers game on August 24, 2016.
Zac posted this brotherly photo in honor of Dylan's 31st birthday in February 2023, writing in the caption, "Here's to many more years of shared adventures and endless good times. Love ya!"
The actor shared an adorable moment with Olivia on her birthday in December 2022.
"Happy bday lil sis," he captioned this sweet snap.
Zac greeted Dylan at the finish line when he ran the Nautica Malibu Traithalon in September 2016.
The Baywatch star rode bikes with Dylan during a sunny outing in Los Angeles in June 2017.
Zac and Dylan went camping in the family's new van in July 2017.
They're all in this together! Zac marked Dylan's birthday in February 2022 with a hilarious tribute, reading, "HBD lil bro! 30 years and we're still up to the same $&!+."