A man and the teenage sister he is accused of killing were not a ‘good mix’, jurors heard.

The former foster father of Connor Gibson and 16-year-old Amber Gibson made the claim at the High Court in Glasgow on Thursday.

Gibson is on trial charged with the sexual assault and murder of Amber at Cadzow Glen in Hamilton on Friday, November 26 2021.

READ NEXT: The murder trial of Amber Gibson begins at Glasgow High Court

The court heard the 20-year-old contacted his ex-foster dad Craig Niven after Amber had been found claiming he had been "banged up" as police suspected he may have been involved.

Gibson denies the charges at the trial before judge Lord Mulholland.

Mr Niven was the first witness in the case.

He told how him and his wife Carol had been foster parents since 2006.

Two years later, the couple had been approached to look after Gibson and younger sister Amber.

Amber stayed with them until 2019 before moving to Hillhouse Children's Unit in Hamilton.

Gibson was with them until around his 18th birthday in 2020.

READ NEXT: Former Rangers star fined at Glasgow Sheriff Court for speeding

Prosecutor Richard Goddard KC asked the witness: "Fair to say during the years you had care of them, there were occasions where they got on and occasions they did not get on?"

Mr Niven replied: "Yes."

Mr Goddard asked: "Were you comfortable leaving them in each other's company?"

He replied: "No."

The advocate depute: "Would you describe them as good mix or not?"

Mr Niven said: "No."

Mr Niven told how he was alerted on November 27 2021 that Amber had gone missing from the children's unit.

He was then told the next day a body had been found which was believed to be Amber.

Gibson later went on to call Mr Niven stating he wanted to "touch base" and that he was in East Kilbride.

Mr Goddard asked: "Did he say anything about what had happened between him and Amber?"

Mr Niven said: "He said that he had seen Amber and that they had a fall out.

"He had been banged up for 12 hours on the Saturday and that police thought he had something to do with Amber."

Gibson was described as "just speaking normal" and was not "emotional" during the call.

A friend of Amber's who stayed with her at the children's unit also gave evidence.

Angel McKean said she had regarded the teenager as a "wee sister".

The 19-year-old recalled seeing Amber at the unit on the night of the alleged murder.

Miss McKean: "She said that she was going to meet her brother and seemed quite excited about it."

The witness did not see Amber again - however, she recalled getting sent a photo from her via Snapchat that night.

It was timed at 9.51pm on November 26.

Jurors were shown the "selfie-style" picture of Amber with a male in a baseball cap with the caption "My big bro".

Miss McKean discovered the next day Amber had not returned.

She tried messaging her friend, but did not get a reply.

The unit's manager Ian Currie, 55, earlier told the trial how Gibson had called the establishment on November 26 looking to speak to his sister.

He recalled "trying to discourage" Amber from going out that night due to the bad weather, but that she was meeting her brother.

Mr Currie went on to describe his attempts to try and find the teenager when she went missing.

He said it had been "unusual" for her not to contact the unit if she had been out late.

The witness went driving around Hamilton and nearby Blantyre.

He said: "Just to hopefully see her standing somewhere or walking back."

Prosecutors claim Gibson removed Amber's clothes and repeatedly inflicted blunt force trauma to her head and body.

Gibson - who also uses the name Niven like his sister did - is then said to have strangled the teenager with his hands.

It is claimed he did this with intent to rape Amber and did murder her.

Gibson faces further charges of attempting to defeat the ends of justice and attempting to pervert the course of justice.

This includes claims he got rid of clothes he had been wearing and that he called the children's home Amber was staying at to pretend she was still alive.

Gibson is also said to have told police he last seen his sister after she walked off from an argument near to a community centre in Hamilton on the day of the alleged killing with him then allegedly visiting another man in the town.

Stephen Corrigan, 45, is a co-accused of Gibson.

He does not face the murder allegation, but is instead charged with breach of the peace and attempting to defeat the ends of justice.

It is claimed Corrigan found Amber's body, but rather than alert police, he inappropriately touched her and then hid her remains under bushes and branches.

This is said to have occurred on an occasion between November 26 and 28 2021.

Corrigan also denies the allegations and has lodged a special defence of alibi that he was elsewhere at the time.

The trial continues.