But who are they and what have his sons said about his singing in the jungle? – here's the lowdown…
Who are Nick Knowles children?
Nick Knowles has five children – four sons and a daughter.
Daughter Tuesday, 25, and Nick's eldest son Charlie, 24, are from his first marriage to ex-wife Gillian.
TJ, 24, is the result of Nick's affair with former Dancer Paula Beckett.
He has 13 middle names – his full name is Tyrian-J, Charlie, Spencer, Eric, Edwin, Harvey, Cosworth, Byron, Darwin, August, Mayhem, Beckett, Nicholas, Simon, Knowles.
Nick's youngest son Eddie was born in 2014 during his marriage to Jessica Rose Moor.
What did Nick Knowles' sons say about his singing on I'm A Celebrity?
Nick's sons appeared on Lorraine to defend their dad after he faced criticism for his singing on I'm A Celebrity.
The DIY SOS presenter played guitar and sang for his fellow camp mates after hearing that his single Make You Feel My Love reached number one in the Itunes chart.
One Twitter user wrote: "Nick Knowles singing… Oh my ears are bleeding. Please stop!"
Speaking on Lorraine TJ said: "He loves singing so much, he is so musical.
"He plays a guitar so well. His singing isn't half bad as well."
But Charlie added: "He's definitely better at the guitar than he is at singing."
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When is the I'm A Celebrity final?
The I'm A Celebrity final will air on December 9, 2018 at 9pm on ITV.
The winner is usually crowned by the jungle king or queen from the previous year.
However the 2017 winner Georgia Toffolo will break six years of tradition by not being present at the final.
Harry Redknapp is the favourite so far to win the show at odds of 5/4.
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