Behind the scenes of Australia's most famous family lies a feud that has been raging for over a decade...
The Irwin rift has come to light after Bindi Irwin accused her estranged grandfather, Bob Snr, of "ignoring her" since she was a child.
But since posting her scathing comments, other members of the family have spoken out against her, describing Bob as a kind and caring man.
This comes after years of tension building up between all sides of the Irwin clan.
When Steve Irwin was killed by a stingray barb in September 2006, the once close-knit family fell apart.
Steve's father, Bob, founded what is now known as Australia Zoo back in 1970 with his wife Lyn.
He handed ownership of the park to Steve and Terri in 1992 but remained involved in the upkeep of the zoo. However, after Steve's death, Bob left the park after falling out with Terri about how things should be run.
Bob spoke out about his relationship with Bindi in 2015, telling The Herald Sun they no longer had contact.
"I don't like to talk about family matters but no we are not in contact," he said, "It's sad but it's just the way things are."
Bindi addressed their estrangement on Sunday, posting a Facebook status about him.
She uploaded a post for Father's Day, saying she was thankful for the "3 most incredible fathers in her life," her father Steve, husband Chandler Powell, and father-in-law.
When a fan asked why she didn't include her grandfather, she wrote that he hadn't been involved with her since she was little. "I really wish that my entire family could spend time with [her newborn daughter] Grace. Unfortunately, my grandfather Bob has shown no interest in spending time with me or my family."
She even said Bob had "returned gifts I've sent after he opened them," and ignored letters she sent to him.
"From the time I was a little girl he has ignored me, preferring to spend time doing anything else rather than being with me," she continued, "He has never said a single kind word to me personally. It breaks my heart."
She went on to say that Terri still sends cards and gifts, but they never get a reply.
"We have also been his financial support since 1992 when he retired from Australia Zoo, sending him funds every week," she added, "We built him a house on a beautiful property and will always do our best to ensure his wellbeing."
"I hope everyone remembers to be kind to one another but most of all care for your own mental health. I have struggled with this relationship my entire life and it brings me enormous pain."
Bob Snr has yet to publicly respond but Bindi's cousins have come to his defense...
Bethany Wheeler, another granddaughter of Bob's wrote in a Facebook post on Sunday: "The time has come to speak up."
"I read some absolutely appalling comments by Bindi today! Feel free to share this post (I will make it public) as we have all been silent... for too long."
Wheeler defended her grandfather, calling him "one of the most genuinely beautiful humans on this planet" who has "never spoken out or put down anybody."
"He is a man who sits silently and battles his demons alone, in what is great sadness. He doesn't retaliate, only prays for his grandchildren's safety and good lives," she continued.
Bob's other granddaughter, Toni Johnstone, also claimed Steve would have been "furious" about Bindi's comments.
Commenting on Facebook, Johnstone wrote, "I honestly cannot believe how [Bindi] can [accuse Bob of these things] and then preach 'let's be kind to one another' in the same post."
"Let's hope [Bindi and Terri] remember who built the zoo that made them who they are today."