A BOY raped his six-year-old sister by acting out a sex scene from Grand Theft Auto, a court heard.

The child, 12, smirked as he told a judge about his dreams of becoming a professional footballer - as he was let off with a 12-month therapy order.

3 The boy, 12, raped his sister after watching a GTA sex scene Credit: Handout

He raped his victim several times while his parents were asleep - with one attack coming on Christmas Day.

One sickening attack took place in front of another young sibling and came after he watched a sex scene from Grand Theft Auto.

His tearful mum clasped his hand as the graphic charges - three of rape and one of inciting the the girl to engage in sexual activity - were read out at Swindon Youth Court.

They will be struck from his criminal record if he completes a 12-month referral order at an out-of-town therapeutic facility.

My daughter used to be very sad about it all because she worried this was her fault Mum of sex attack kids

The boy, from Swindon, Wilts, sat impassively for most of the hearing.

But he chuckled when the judge asked him about becoming a footie star.

He was caught after his sister confided in a teacher about the abuse.

When interviewed by police, he initially denied the offences but later admitted his guilt.

His mother said: "We just want to make things right and do what's best for the safety of the children.

"He's doing really well and I want to make sure we can all be a family again at some point.

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"My daughter used to be very sad about it all because she worried this was her fault.

"She's come on leaps and bounds, she's a very strong girl and there's not an ounce of sadness in her now, I'm so proud of her."

He was added to the sex offenders register for two-and-a-half years.

3 He was handed a twelve-month referral order at Swindon Youth Court Credit: Alamy

3 One of the rapes took place on Christmas Day Credit: AFP - Getty

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