A teenager carried out an armed robbery on a family who took him in after he was caught at the centre of a scandal involving his teacher.

Gary Ralston took part in the attack armed with an axe, a baseball bat and a butcher's knife, at the home of a woman who took him in "as a son" following furore over the previous case.

The 19-year-old teamed up with a convicted armed robber to raid the home of Marion Bowmaker and her son Ben.

The High Court in Stirling heard the teenager and accomplice Gavin Landsborough wore balaclavas when they burst into the property in Cowie, Stirlingshire.

They threatened the Bowmakers and used fake Glaswegian accents during the incident, while at one point Landsborough slipped up by referring to Ralston as Gary, before stating "eh, eh, no, Johnnie".

On Monday, Ralston was found guilty of carrying out the armed robbery on December 11 last year.

Landsborough pleaded guilty in March and was jailed for 40 months.

Lord Ericht continued the case for sentencing next month and told Ralston he had been convicted of "a very serious offence" for which he would not normally grant bail but would do so because of his young age and lack of previous convictions.

Prosecutor Paul Brown said it had been a "terribly callous" attack.

During the trial, Ms Bowmaker said she had taken Ralston in "as a son" and he had lived with her for three months after he had spent a night in bed with history teacher Bernadette Smith.

In 2014, Ms Smith admitted engaging in sexual activity with Ralston, who was then a pupil at Bannockburn High School where she taught.

She was placed under supervision for two years as part of a community payback order and was placed on the sex offenders register for the same period.

She had spent the night in bed with Ralston and had told colleagues she was "in love" with the teenager, who was then in sixth year at the school.

Ms Bowmaker told the court she had allowed the teenager to move into her family home to shield him from media attention surrounding the school sex scandal.

She described the raid as "distressing and horrific" and "couldn't believe what she was hearing" when her son told her: "That was Gary, wee Gary Ralston, mum, he came and lived with us."

Ms Bowmaker said she had thought: "How can he do that to me, how can he repay us by coming in to rob us with weapons and terrify us?"

Ralston and Landsborough took three mobile phones, £20 and a PlayStation 4 during the raid but had to get 49-year-old Ms Bowmaker to open the door for them because they could not unlock it.

Once outside, Landsborough found he could no longer see through his balaclava and ripped it off in panic after becoming disorientated, allowing his victim to clearly see his face.

They made their getaway on the next bus to Stirling. When they got to Landsborough's home they found no one was willing to buy the PS4, with one contact stating it could be "hacked and tracked" in hours.

The console was discovered by police who raided the flat the following day, along with their balaclavas and the weapons they used.