Princess Kate's parents, Carole and Michael Middleton, have held crunch talks with Gary Goldsmith.
The Princess of Wales's uncle looks set to appear on TV as a contest on ITV's Celebrity Big Brother.
The Middletons have read Goldsmith the "riot act" and are unhappy that he has signed up for the TV show according to a source.
The insider said: "Gary said he’s been read the riot act by Kate’s mum Carole and her dad Michael.
Princess Kate's parents, Carole and Michael Middleton, have held crunch talks with Gary Goldsmith.
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"They aren’t happy he’s going into Celebrity Big Brother.
"It is infuriating for them. Kate doesn’t need this stress."
It comes as an insider dubbed Goldsmith the "black sheep" of the Middleton family.
They told The Sun: "In the eyes of the public, Gary’s become the black sheep of the Middleton family.
Gary Goldsmith is Carole Middleton's brother.
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"Carole is his sister, so there will always be love, but they no longer see eye-to-eye on lots of things.
"He has said he doesn’t have their blessing to go into the house but is going full steam ahead anyway.
"He wants to defend his family. Gary wouldn’t do anything to embarrass Kate or William, who he thinks a lot of.
"With Kate being out of the public eye at the moment and William shouldering a lot, the last thing they want is for Uncle Gary to be causing any embarrassment on television.
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Princess Kate is not expected to undertake any royal duties until after Easter.
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"Gary has said he knows what he is doing and has told his friends he’d never do anything to hurt his family."
Princess Kate is currently recovering from abdominal surgery at her home in Windsor.
The Princess of Wales underwent the operation in January and spent two weeks in the London Clinic after the surgery.
Princess Kate is not expected to undertake any royal duties until after Easter.
