The youngsters, Joe, Emilie and Harry – who are his eldest son Mark’s children – sent their best wishes to the I'm A Celeb star as they enjoyed a break in Lapland.
Looking very excited in the clip, they said: "We’re just in Lapland and have just met Santa, but the only person we want to see is you."
In unison they added: "Good luck in the jungle during your final days. Go Grandad!"
Harry is also granddad to Charley and Beau, whose parents are Jamie Redknapp and his now ex-wife Louise.
The footballer manager is currently the favourite to win the show, as bookmaker Coral has cut his odds again – this time to just 2-5.
Just six celebrities remain in the camp now and Emily Atack (6-1 to win) and Fleur East (8-1) are the only others given single figure odds.
Jamie has also showed his support for his famous dad with an amazing throwback to when he was a child.
Referencing the fact his dad has won over the nation with his amazing stories, he captioned it: “Tbt to before he was the most famous storyteller in town.”
The footballer didn’t actually know his dad was going on the show and only found out when he read it in the paper.
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He said: "I was actually really surprised when I found out he was going to be on it because he didn’t tell me, I read it in the paper.
He added to the Mirror: "He was like 'If I had told you, you would have told me off.'
"I’m going to try and vote him out. I want to get him to come home and see my mum and get him out of there.
“My mum is more nervous than anything as she misses him whenever they are apart.”
Listen to new podcast Jungle VIP, talkRADIO's cheeky, no-holds-barred take on the action Down Under. Hosted by Jamie East with daily guests, including former campmates and celeb reality TV fans the gang will dish the dirt on the REAL behind-the-scenes gossip. Read more here.
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