PC Harpers mother asked Anne Sacoolas if she could "begin to imagine if what happened to Andrew and Harry had happened to one of your children?"
Henry Long, 19, and 18-year-olds Albert Bowers and Jessie Cole were convicted of manslaughter but cleared of murder on July 24.
Pc Harper's widow Lissie said she was "immensely disappointed" with the verdict.
The number of people infected with coronavirus topped 110,000 across the world, but it's not the only story in town.
The newlywed police officer died from multiple injuries after being dragged under a van in August last year.
Lissie Harper was the passenger on her husband’s motorcycle.
The couple had been married for just four weeks when he was killed on August 15.
The 28-year-old newlywed was killed on duty while attending a burglary in August.
The newlywed police officer was killed in August while responding to reports of a burglary.
The 28-year-old died from multiple injuries after being dragged under a vehicle.