Boy argued with dad before police shot him

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The Queensland teen who was shot after allegedly threatening police with a knife has some problems in life but was never in trouble with the law, his grandfather says.

Police shot the 16-year-old in the upper body after being called to a disturbance at his home in suburban Ipswich, southwest of Brisbane, on Wednesday afternoon.

Two officers opened fire when the armed teen allegedly threatened them as they tried to enter the property. He's in a stable condition in hospital with non-life threatening injuries.

The Queensland Police Union says the officers had no choice but to open fire.

"Tasers are an option but they are not always possible given the circumstances at the time. Police had to use force to protect their lives," union boss Ian Leavers has told ABC radio.

The boy's grandfather said the drama unfolded after the teen got into an argument with his father.

"My son (the teen's father) is all right he has a scratch on him from the knife," the grandfather has told The Courier-Mail.

"They were having a bit of a blue with each other, his dad was trying to control him."

The grandfather said his grandson was quiet, "had an issue in life", and hadn't been to school in years. But he had never been in trouble with police, he said.

"He doesn't walk down the street with his mates ... he doesn't go out in the yard causing trouble ... He's never robbed a pub, he's never done graffiti. He lives at home with his mum and dad."

The grandfather said the family was still waiting for answers.

"This could have been sorted out a little better."

Both officers involved in the shooting were wearing body cameras, and the police union says the footage will form part of an internal police investigation.

The officers were being supported and were cooperating with investigators, union president Ian Leavers said.

Neighbours reported hearing two shots ring out.

"I heard a big row going on and the next thing there was two gun shots so obviously very scary," one neighbour told the Nine Network.

The teen remains in the Princess Alexandra Hospital in a stable condition.

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Image credit: AAP Image/Dave Hunt