In an interview with the Mirror, the Match of the Day presenter's oldest son spoke candidly about growing up and his relationship with his famous dad.
George, 23 – the oldest of the former footballer's four sons – was diagnosed with deadly acute myeloid leukaemia when he was a baby.
He's now clear of the disease and only has to go back to hospital every few years for a check-up.
Now he wants to put something back in the fight against cancer and has signed up for a charity bike ride from Paris to London.
He said: "I feel lucky. I escaped leukaemia and I am the luckiest boy around.
"I feel I need to pay back because of the care I received and raise as much money as I can for charity because my life was saved. I will always keep doing that and take up any opportunity when I am asked.
"It is the least I can do. It changed my attitude to life because I know I could have died. I'm grateful I survived. My dad used to talk about what it was like for him, and I can only imagine."
"When I came out of the five-year stage I had tests once a year but now I go every couple of years just to make sure everything is fine."
George's illness proved a devastating challenge for Gary and mother Michelle. The couple split in 2006 but have remained firm friends.
George – whose brothers are Harry, 20, Tobias, 18, and Angus, 16 – said: "I think that is good. Nothing is ever a pressure in our family. My mum knows Dan and she has met her a few times. They seem to get on.
"Dad didn't sit us down and say he was going to ask Danielle to marry him. He just did it after he had asked her. I remember him telling us he was getting married. There wasn't a family conference. We just said 'well done'. I was happy for him."
So what does he think of his dad Gary's second wife, his 35-year-old stepmum Danielle?
Laughing, George told the paper: "I suppose she's quite hot looking. There's 18 years between them so I suppose she's closer to my age than his.
"I don't see her like a stepmum in a stepmum way. I have always got on well with her. But it isn't weird or anything. We get on just like mates.
"Dan is a really nice woman. She and Dad seem to be very happy together."
George said being a Lineker means he will always be compared to his famous dad, but he takes it in his stride.
He said: "I think I will always feel I am in my father's shadow. But I have just got to do my own thing.
"He's so successful, good looking and has that charm but I can only do as well as I can. My brothers probably feel that as well. I am never going to play for England or be the best sports presenter in the country – none of us are. We are just trying to do our own thing.
"As a lad I was desperate to be a footballer, the same as everyone. But when you realise you're rubbish you have to fade away. Clearly it's not in our genes like the Beckham boys."