A young motorist around two times over the drink-drive limit sobbed uncontrollably as he apologised for the fatal crash which left his nephew an orphan.
Corey Davies was handed a seven-year prison sentence for causing the deaths of his sister Raquel and her fiancé Lee Jenkins.
The 20-year-old lost control of his BMW convertible after overtaking a line of cars at speed on the A4093 near Gilfach Goch, south Wales, on June 7.
Cardiff Crown Court heard that before the defendant got behind the wheel he had been drinking heavily and taking cocaine while celebrating his sister’s 23rd birthday the previous evening.
Davies – who had a previous conviction for drink-driving – had also been warned minutes before the crash by Lee’s stepfather not to drive.
But he ignored the warning and drove off, with the roof down, in his new car, which other motorists later saw “snaking” across the road.
After narrowly missing a head-on collision while overtaking a bus, the car careered off the road and flipped over as well as smashing into a tree. A panic-stricken Davies then fled to his mother’s house.
Both his sister and her fiancé – who had a nine-week old son called Harley – were pronounced dead at the scene.
Appearing via video-link, Davies wept as he told his family and Lee’s relatives “I’m so sorry”.
The Recorder of Cardiff, Judge Eleri Rees, described the case as incredibly tragic for all those involved – especially Davies’s nephew whose grandparents “dread” telling the boy in the future about how he lost his parents.
The court also heard a victim impact statement from Lee’s mother Ann.
It said: “I am distraught every day as my life has been torn apart.
“Every time I look at my grandson as I see Lee. I am constantly worried what will happen to my grandson in the future.”
After admitting causing two counts of death by dangerous driving, Davies, of Porth, Rhondda, was handed a seven-year jail sentence.
He was also disqualified from driving for five years.