Los Angeles - Kate and Oliver Hudson are considered "dead" to their father Bill Hudson.
The 65-year-old actor - who has three other children - has requested the 36-year-old How To Lose A Guy In 10 Days star and 38-year-old Rules of Engagement actor - who he fathered with actress Goldie Hawn - stop using the surname Hudson, as he doesn't consider them to be his after their hurtful posts on Twitter on Father's Day.
At the time, along with a picture of Bill with the two siblings as young children, Oliver posted to his sister on Instagram: "Happy abandonment day..."
Happy abandonment day... @katehudsonA photo posted by Oliver Hudson (@theoliverhudson) on Jun 21, 2015 at 6:18pm PDT
Happy abandonment day... @katehudson
A photo posted by Oliver Hudson (@theoliverhudson) on Jun 21, 2015 at 6:18pm PDT
In response, Bill has now said: "I say to them now, 'I set you free'. I had five birth children but I now consider myself a father of three. I no longer recognise Oliver and Kate as my own.
"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."
Bill went on to insist that he and Goldie didn't part on bad terms in 1980, after being married for four years, and it was only after she got together with Kurt Russell in 1983 that things turned sour.
Speaking to the Mail on Sunday newspaper, 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'."
Kate and Oliver both consider Kurt Russell - who has been involved with Goldie Hawn for 32 years - as their father and posted their own special messages to him on Father's Day.
Pa, just simply..... Thank you ?? Happy Fathers Day I love you to the moon and back. ? #HappyFathersDayA photo posted by Kate Hudson (@katehudson) on Jun 21, 2015 at 9:40am PDT
Pa, just simply..... Thank you ?? Happy Fathers Day I love you to the moon and back. ? #HappyFathersDay
A photo posted by Kate Hudson (@katehudson) on Jun 21, 2015 at 9:40am PDT
Happy Father's Day Pa... ?? #neworleans #felixsA photo posted by Oliver Hudson (@theoliverhudson) on Jun 24, 2015 at 1:19pm PDT
Happy Father's Day Pa... ?? #neworleans #felixs
A photo posted by Oliver Hudson (@theoliverhudson) on Jun 24, 2015 at 1:19pm PDT
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