A man is due in court today in connection with the death of his brother and the alleged attempted murder of his parents and his brother's girlfriend.
Cameron Logan, 23, died in a fire at his family home in Milngavie, East Dunbartonshire, in the early hours of New Year's Day.
His partner Rebecca Williams, 24, was rescued from the house but remains in hospital, while his parents were treated for smoke inhalation.
Detectives launched a major investigation and said on Friday that they were "following a definite line of inquiry".
A 26-year-old man, understood to be Blair Logan, has now been arrested over the incident.
He is due to appear at Dumbarton Sheriff Court today.
A Police Scotland spokesman said: "A 26-year-old man has been arrested and is currently detained in police custody in connection with the death of a 23-year-old man and the alleged attempted murder of a 24-year-old woman, a 54-year-old woman and a 54-year-old man on January 1 2017 in Achray Place, Milngavie.
"A report will be submitted to the Procurator Fiscal."
Ms Williams, a broadcast journalist with Global Radio, was taken to the Queen Elizabeth University Hospital in Glasgow initially in a critical condition. She is now said to be in a stable condition.
The house in Achray Place remained cordoned off on Saturday with large green covers still in place over the property.
Police officers stood guard at the front and back of the semi-detached house and fresh flowers left in tribute to Cameron were placed around a tree outside.
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