The Proctors were on their way to catch a flight to the US
A car dealer who killed a father and son when he smashed into their vehicle on the M62 near Rochdale has been told he faces a "substantial" jail sentence.
At Bolton Crown Court, Iram Hussain admitted causing the deaths of Gary Proctor, 47, and James Proctor, 16, by dangerous driving.
The two, from Wakefield, died after the crash on 3 August between junction 19 and 20 near Birch services.
Hussain, of Como Avenue, Bradford was twice the drink-drive limit.
Mr Proctor's wife, Catherine, aged 44, survived the crash, but suffered serious rib and arm injuries.
The family were on on their way to Manchester Airport for a holiday in Florida.
A charge of making a threat to kill a petrol station attendant in Leeds was allowed to lie on Hussain's file.
He was arrested at the scene of the accident, after his Audi Quattro struck the back of the Proctors' Fiat Punto on the westbound carriageway.
Adjourning the case for pre-sentencing reports, Judge Andrew Blake said: "It is inevitable that a substantial prison sentence will follow."
Hussain was remanded in custody until 8 December when he will be sentenced at Manchester Crown Court.