Why Kate Hudson is so mad at her dad

This bit of Father's Day news was late in breaking: Kate Hudson's not-so-famous father has publicly disowned his incredibly famous daughter.

The inciting incident, part of feuding that stretches back decades, was an Instagram post from Kate's brother Oliver Hudson. Oliver, lately of "Nashville," is, like Kate, the child of musician Bill Hudson — of the not incredibly popular band the Hudson Brothers — and actress Goldie Hawn.

"Happy abandonment day. . . @katehudson," Oliver Hudson wrote on Instagram round about Father's Day.

Father Bill Hudson — who wrote a tetchy tell-all about Hawn and his progeny in 2011 — quickly spoke out.

"I say to them now, 'I set you free,'" he told the Daily Mail. "I had five birth children but I now consider myself a father of three. I no longer recognize Oliver and Kate as my own."

He added: "I would ask them to stop using the Hudson name. They are no longer a part of my life. Oliver's Instagram post was a malicious, vicious, premeditated attack. He is dead to me now. As is Kate. I am mourning their loss even though they are still walking this Earth."

Kate Hudson did not reply directly to her brother's post or her biological father's comments. However, on Father's Day, she offered a message of love to the man she considers her real dad: Hawn's longtime companion, movie star Kurt Russell.

"Pa, just simply ... Thank you," she wrote, posting a photo of herself and Russell. "Happy Fathers Day I love you to the moon and back."

Also of interest was an older post from Oliver.

"Happy birthday to the greatest dad in Santa Monica," he wrote a few months ago next to a photo of Russell as Snake Plissken in John Carpenter's "Escape from New York." "I love you more than you realize ... Before you came into my life, I was only potential and you made me, forced me, to find my confidence, my independence and strive for the elusive fearlessness that you so matter of factly possess ... I look up to you and always will."

Kate Hudson has had unkind words about her father in the past. Well on her way to an Academy Award nomination for "Almost Famous" more than 15 years ago, she spoke out about Bill in a Vanity Fair cover story.

Her biological father "doesn't know me from a hole in the wall," she told the magazine. "But I don't care. I have a dad (Russell). The bottom line is, you call your kids on their f__ birthday. I'm glad I had a dad who was there on my birthday."

Bill Hudson was quite unhappy about this at the time. "It's infuriating," he said. "I'm so upset. I'm not going to take this on the chin from my daughter anymore."

Though Hudson and her dad evidently tried to mend the rift, she was soon attacking him in McCall's.

"Kurt is my dad," she told the magazine in 2000. "Kurt is a savior who came into my life. (Bill) was sort of in and out of our lives. I don't hate him for it. I guess what I feel is frustration and curiosity — like, what was it about me he didn't want to know?"