Joshua Dobby was sentenced to twelve years in prison, with three additional years on extended licence - he will have to serve a minimum of eight years - for the manslaughter of Rozanne Cooper and her 10-year-old nephew Makayah McDermott.
He has been disqualified from driving for 15 years.
Dobby had pleaded guilty at the Old Bailey on 2 February to the above two counts of manslaughter, as well as pleading guilty to dangerous driving relating to an offence committed in Kent on 26 August which was identified as part of the investigation into the fatal collision in Penge.
Prior to that, Dobby also pleaded guilty on 30 September 2016 at the same court to causing serious injury by dangerous driving to a 13-year-old girl (one of Makayah's twin sisters) who sustained serious leg injuries.
Dobby received a sentence of three years and four months' imprisonment, for the count of causing serious injury by dangerous driving, and sixteen months for the Kent offence, both to run concurrently.
The sentencing follows an investigation of a collision between a car and a number of pedestrians in Lennard Road, SE20 at around 14:00hrs on Wednesday, 31 August 2016.
The car, being driven by Dobby, was reported stolen and was being pursued by police at the time of the collision.
Detective Sergeant Jo Densham, from the Met's Serious Collision Investigation Unit, said:
"Dobby is a highly dangerous individual who showed a blatant disregard for the safety of other individuals who might be affected by his actions.
"We hope that this sentence - while it will never make up for the tragic loss of loved ones for the families involved - will act as a deterrent to others."
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