The winner of the ITV show will get top billing at the Royal Variety Performance, where they will show off their talent, and also walk away with an impressive £250,000 in prize money.
In an exclusive interview with Express.co.uk, Toby Gray said: “It will be a military charity because he’s an army child. He spent his formative years up until six years’ ago being an army child moving between army postings.”
The singer’s dad, who was the former Commander of the Coldstream Guards and has completed tours in Iraq and Afghanistan, said that it would most likely be a range of army-related charities that the donation would be made to.
He explained: “I think when I was in Afghanistan – that had a positive effect on him in some ways but at the same time he feels because there were some guys injured on that tour and killed, he wants to support some military charities that are helping the children of those who lost their lives.”
Toby added: “He’s just got it in his mind that that’s what he wants to do with a considerable amount of the money were he to win.”
This is not the first time the talented schoolboy has helped to raise money, as at the tender age of 10 he was selling wristbands and helped to make a considerable amount along with a number of other volunteers.
Reuben Gray auditions on Britain's Got Talent
Reuben Gray performs on Britain's Got Talent
He’s just got it in his mind that that’s what he wants to do with a considerable amount of the money were he to win
“Well, he helped us when we were in Afghanistan and we had a bit of a fundraising activity going on. We were selling a lot of wristbands for the regiment and he helped a lot with that and we raised about half a million pounds,” Toby said.
Reuben’s first audition saw the teenager left shocked after Toby – who works overseas – made a surprise appearance in the audience, leaving him emotional.
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Toby, who has since left the army but still works abroad, returned yesterday from his latest job in Kenya to watch his son perform tonight with the hope Reuben will make it through to the final on Saturday.
The 16-year-old performed in the fourth semi-final live show and is hoping to go through to the next round.
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Reuben Gray performed tonight on Britain's Got Talent
Reuben also spoke about Britain’s Got Talent, ahead of his performance this evening saying that he felt “lucky” that his dad would be in the auditorium again.
He faces tough competition from John Parnell – also known as the Hoop Guy, Paws with Soul, Angelicus Celtis, Jonny Awsum, MerseyGirls, The Pensionalities and Ryan Tracey.
Already in the final are Kyle Tomlinson, mind reading act DNA, magician Matt Edwards, Issy Simpson, Tokio Myers and comedian Ned Woodman.
Britain’s Got Talent continues on ITV tomorrow at 7.30pm.