The Kardashians and Kris Rally Around Bruce Jenner on Twitter After Diane Sawyer Interview

The Olympian is set to tell his story Friday night in an interview with Diane Sawyer

Photo: Axelle/Bauer-Griffin/FilmMagic

Update: In June 2015, Caitlyn Jenner came out as a transgender woman. This content was written in April 2015, before Jenner publicly announced her full transition.

As Bruce Jenner told the world he’s transitioning from male to female, his youngest daughter Kylie Jenner supported her dad on social media.

“Understandingly, this has been very hard for me,” she Tweeted on Friday night. “You will hear what I have to say when I’m ready to but his isn’t about me. I’m so proud of you, Dad. You are so brave. My beautiful Hero.”

Kris Jenner, Kendall Jenner, Khloé Kardashian and Kourtney Kardashian also Tweeted well wishes.

Earlier in the day, Kylie, 17, posted a vintage photo of her father.

“daddy throwback. #Tonight #DianeSawyer #ABC #love,” she captioned the shot of Jenner wearing jean cutoffs and a t-shirt showcasing his toned stomach.

Jenner, 65, discussed his journey in a 20/20 interview with Diane Sawyer set to air Friday at 9 p.m. ET on ABC.

A source previously told PEOPLE that Jenner’s six kids and four step-children have rallied around the Keeping up with the Kardashians reality star.

“They all came all around pretty quickly, but each of them had to process it in their own way,” the insider said. “All they want is for him to be happy.”

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