Following Oliver's Instagram post on Father's Day, the duo's biological father Bill Hudson has spoken out and cut all ties with Kate and her brother.

Taken more than 30 years ago, the Instagram post showed a smiling Oliver and Kate as happy children, posing with their father. Oliver wrote: "Happy Abandonment Day.... @katehudson."

It was the caption beneath the photograph that made Bill react negatively, saying that his son and daughter are considered "dead" to him. "Oliver's Instagram post was a malicious, vicious, premeditated attack. He is dead to me now. As is Kate," he said. "I am mourning their loss even though they are still walking this earth."

The 65-year-old actor has requested Kate and Oliver to stop using the surname Hudson, as he doesn't consider them to be his children after their hurtful posts on Twitter on Father's Day.

"If what he wanted was me out of their lives, then he's succeeded. I don't want to see either of my eldest children ever again. It's over."

"That was like a dagger to the heart," he said in an exclusive interview to Daily Mail. "If what he wanted was me out of their lives, then he's succeeded. I don't want to see either of my eldest children ever again. It's over."

Bill insisted that he and Goldie didn't part on bad terms in 1980, after being married for four years. According to him, it was only after she got together with Kurt Russell in 1983 that things turned sour.

Bill said: "When we split up, she never had a bad word to say about me. But when Kurt came on the scene, the narrative changed and I became the big, bad wolf."

"I would say to her, 'Goldie, why are you trashing me and saying I'm an absent father when it's simply not the case?' and she'd laugh and go 'Oh Bill, you know it makes for a better story'," he claimed.