A 14-year-old boy is in a serious condition after driving off in his elder brother's car following an argument with him and overturning it at Stanley yesterday. The boy sustained a fractured arm, head and facial injuries. Last night he was still undergoing treatment at Eastern Hospital. Detectives from Aberdeen were hoping to take a statement from him for allegedly illegally taking a vehicle and driving without a licence and third-party insurance. Police said initial inquiries had revealed the schoolboy had a quarrel with his brother, 25, at their luxury Redhill Peninsula home in Pak Pat Shan Road at about 3.45pm. He reportedly grabbed his brother's car keys, ran out of the house and drove the Honda Jazz out of the garage - with his brother chasing after him on foot. The boy reportedly drove the small, automatic car about 500 metres to Red Hill Road. He then crashed against roadside railings and overturned the car outside Red Hill Plaza, officers said. Police inquiries were continuing.