October 14, 2025 - Zac Efron celebrating his sister Olivia's 3rd birthday in December 2022.

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October 9, 2025 - Zac and Dylan also have a younger sister named Olivia and a younger brother named Henry. ... Zac Efron has been open about his bond with his family over the years. Zac, who rose to fame after playing Troy Bolton in Disney Channel's High School ...

Younger sister of the famous actor Zac Efron. She has appeared on his Instagram, where he has over 50 million followers.

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September 17, 2023 - So sweet. Random fact:: They are from when I’m from. When Zac was a kid, he did a lot of local musical theater. My little brother and sister did a lot of it with him . I remember him and my much younger siblings doing shows and stuff when they were like 11.

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November 25, 2025 - Born on Christmas day in 2019, Olivia is the first child of David Efron and his current wife, Jenny. Though there’s a sizable, 28-year age difference between Olivia and her next oldest brother, it’s clear this age gap hasn’t stopped the siblings from becoming super close. Zac’s fans will have spotted his adorable sister on his Instagram page frequently, with the High School Musical star sharing this sweet picture of him reading a book to Olivia, affectionately calling her “my Valentine” in the caption.

October 15, 2025 - Dylan dedicated the routine to the Efron boys' 5-year-old half-sister, Olivia. In a pre-dance video from rehearsal, Dylan explained, "I wasn't expecting to be a big brother. She's 5, and I'm 33. But immediately I was inseparable from her. She's everything to me. I want to show her to live her life with confidence." He also explained that he had to sneak in a tribute to Zac, 37, who has "always taken care of me and he did things that were so selfless, I want to be that to Olivia."

January 7, 2023 - Dylan made his own post saying sorry Zac she’s already my valentine and posted a video of them at the beach. They love her so much it’s so sweet. ... She’s his half sister.

October 31, 2025 - Both Zac and Dylan publicly praise each other and maintain a close sibling bond. Dylan Efron is a reality TV contestant and producer; Olivia and Henry are younger half-siblings.

September 15, 2025 - His father, David Efron, is an ... works at Diablo Canyon. Efron has a younger sister and two younger brothers, including Dylan Efron, and had, as he has described, a "normal childhood" in a middle-class family....

June 5, 2024 - Zac’s only sister, Olivia, was born to David and his wife on Dec. 25, 2019. Since then, the little girl has stolen Zac and Dylan’s hearts as they frequently post with her on their Instagrams.

October 14, 2025 - Zac Efron Instagram Zac Efron celebrating his sister Olivia's 3rd birthday in December 2022

October 15, 2025 - Olivia is the only girl in the Efron family. Born to David and his new wife in December 2019, the toddler has appeared on both her older brothers’ Instagram accounts. Zac and Dylan even have a comical rivalry over which sibling Olivia prefers ...

November 19, 2025 - Zac Efron made a surprise appearance during the November 18 episode of Dancing With the Stars to support Dylan Efron. Dylan honored his little sister, Olivia, on Dedication Night earlier this season.

October 14, 2025 - Zac Efron celebrating his sister Olivia's 3rd birthday in December 2022.

March 24, 2025 - Nobody knew about her existence until her brother, Zac, posted a photo on his Instagram account on July 19, 2021, with the caption ‘My sister Olivia, little heartbreaker.’ · Olivia is Zac’s step-sister as she was born from her father’s second marriage.

October 13, 2025 - Get out the tissues for Dancing With the Stars’ Dedication Week, because Dylan Efron’s younger sister, Olivia Efron, has already won over the hearts of the cast and fans. “Please welcome the newest member of Team DaDy, my lil sister Olivia,” ...

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