Killer Blair Logan shared a 'hostile' relationship with his brother Cameron before murdering him at their parents' home in Milngavie

The court heard the two brothers had a ''hostile'' relationship, and Logan told police they had not spoken since the death of their grandmother in 2013.

He murdered his brother Cameron, 23, in a New Year's Day inferno after pouring petrol on him and his girlfriend Rebecca Williams, while they slept in their bed. 

Ms Williams was rescued from the fire and treated in hospital, while Logan's parents were treated for smoke inhalation.

The attack was said to be in retaliation for a recent incident at the house when his brother had punched him.

Logan admitted pouring petrol ''with the intention of maiming or crippling'' Cameron, but claimed he did not mean to kill him.

In the months leading up to the incident Logan carried out internet searches on burns victims, seen by police after his computer was seized. 

Logan, 27, pleaded guilty to charges of murder and attempted murder last month and was given a life sentence with a minimum of 20 years, reduced from 24 because of his early plea, at the High Court in Edinburgh on Friday.

Judge Lady Scott said Cameron had died a "horrible death" and that Logan "acted with wicked recklessness".

The judge accepted court reports that he had "abnormal personality traits" but said there was no suggestion that Logan had a mental disorder and was fully criminally responsible for his actions.

The 27-year-old, who was a Tesco store assistant, admitted killing his brother during a police interview on January 13.

He told officers: ''It was not my intent to kill him but I did do it.''

When charged with the attempted murder of Ms Williams, he said: ''I thought she was out of the room'', and added: ''I did not wish to murder my parents.''

Logan had also admitted endangering the lives of his parents David and Catherine in the blaze, in which the family dog Gomez was also killed.

In mitigation, defence QC Shelagh McCall said Logan had shown genuine remorse and views the murder of his brother as "horrific" and that it cannot be justified.

She referred to a letter that his parents had written to the court which said they "find it extremely difficult to reconcile the Blair they know with the Blair who caused Cameron's death".

Both parents were in the court room in Edinburgh, along with Ms Williams and her family, as the sentence was passed by Lady Scott.