Zac Efron has three younger siblings: Dylan, Olivia and Henry
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Zac Efron/Instagram;officialdwts/X
As the eldest brother, Zac Efron dotes on all his younger siblings.
Zac's parents Starla Baskett and David Efron welcomed him and his brother Dylan in 1987 and 1992, respectively. After Starla and David's divorce in 2016, David remarried, and with his new wife, they had two children: Zac's half-siblings Olivia and Henry.
Both Zac and Dylan share a close bond with their younger brother and sister, frequently sharing goofy snaps on social media. During Dylan's Dancing with the Stars run, he dedicated his dance to "Rewrite the Stars" — from Zac's movie The Greatest Showman — to Olivia.
To mark Dylan's 34th birthday on Feb. 6, 2026, see the Efrons' most adorable sibling photos.
01 of 15
Now Introducing…

Zac celebrated Dylan's 25th birthday in 2017 with a selfie of the two — at the time, a rare sighting.
"This is my brother Dylan- it's his birthday today- I love the crap out of him," the star wrote on Instagram.
02 of 15
What a View

Zac Efron/Instagram
Five years later, he marked another milestone for Dylan with a belated 30th birthday post. "30 years and we’re still up to the same $&!+," he captioned the post.
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Flower Crown

Zac Efron Instagram
Zac looked lovingly into his baby sister's eyes in a photo shared on Olivia's 3rd birthday.
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Abs-olutely Fantastic

Zac Efron/Instagram
Dylan and Zac showed off their fit physiques on a sibling boat trip.
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Clowning Around

Zac Efron Instagram
The Iron Claw star had his hands full with Henry and Olivia as the three took a trip to the circus.
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Hanging Out

Dylan Efron Instagram
In a rare snap of all four siblings, Zac and Dylan horsed around with Olivia and Henry by picking them up by their legs.
"I know exactly the type of big brother I want to be for Olivia and Henry because you were that brother to me," Dylan wrote to Zac on the Disney alum's 35th birthday.
07 of 15
Star for a Star

Leon Bennett/Getty
David and Starla joined their two sons to commemorate Zac's Hollywood Walk of Fame star.
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Take It or Leaf It

Dylan Efron Instagram
Dylan posted an adorable picture of Henry and Zac, who was having a goofy moment to make his little bro laugh.
09 of 15
Who Let the Dog Out

Dylan Efron Instagram
Ahead of Olivia's third birthday, Dylan asked his followers for gift suggestions. "Just tryin to stay her favorite brother over here," he captioned the smiley photo.
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Story Time

For Valentine's Day, only one person had Zac's heart: his beloved baby sister!
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Beachy Keen

Zac Efron/Instagram
Zac and Olivia rang in the first day of spring with a sunny trip to the beach.
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To the Top

dylanefron/Instagram
Henry and Olivia accompanied Dylan to his Dancing with the Stars rehearsals with Daniella Karagach.
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Dance the Night

Disney/Eric McCandless
At the end of his Dedication Night dance, Olivia joined Dylan on the floor for a few steps.
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Show of Support

Eric McCandless/Disney via Getty
Zac (seen with Julianne Hough) made his first Dancing with the Stars appearance to support his younger brother (and give his little sis a boost) during the semifinals.
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Bro Backstage

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The official DWTS account shared a BTS picture of the brothers ahead of Prince Night.
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