Zac Efron and Sister Olivia Swim in Sea, 4: 'First Day of Spring'

Zac Efron is bonding with his kid sibling! The 36-year-old actor posted a lovely Instagram video of himself playing in the sea with his 4-year-old sister Olivia and brother Dylan Efron on Tuesday.

The video began with Zac kissing Olivia's cheek while carrying her as she looked out at the ocean.

Olivia said, “Ah ah, wave,” as her older brother pulled her by the hands as the waves crashed.

Dylan, 32, joined Zac in swinging their sister over the lake. Dylan posted a video of him and Olivia playing in the sea on Instagram with the remark, "'it was a perfect day’ - Olivia."

Zac and Dylan are proud sons of David Efron and Starla Baskett, who divorced in 2016. David's second marriage brought Olivia and Henry, the boys' younger half-siblings.

Zac and Dylan post photos of themselves and their younger siblings on social media. Dylan wrote a touching homage to The Iron Claw star on his 36th birthday in October, including a photo of all four siblings.

Dylan joined Zac at his Hollywood Walk of Fame star ceremony, where Efron told PEOPLE about his parents' sacrifices so he could become an actor.

“My mom and dad, they're the reason I'm here today,” Zac told PEOPLE following the wedding in December. “I don't know how they believed in me. It must have been hard to drive me to auditions when I was 15, three hours from the Arroyo Grande, for such a slim chance.”

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