anne sacoolas
US citizen avoids jail when finally appearing before a UK court over the killing of the 19-year-old.
Suspect Anne Sacoolas agreed to a resolution with Dunn's family in the civil case.
Lawyers for alleged killer of 19-year-old motorcyclist issue public statement.
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?"
Anne Sacoolas returned to the US after the 19-year-old's death last year.
Anne Sacoolas, 42, was charged with causing death by dangerous driving in December, but the US rejected an extradition request.
Boris Johnson admits relationship may be "imbalanced" in response to claims Harry Dunn's alleged killer worked for American security services.
The family has called for a "full public enquiry into who knew what and when".
Lawyers For Harry Dunn And Epstein Victims Call For Exchange Of Road Death Suspect And Prince Andrew
The pair are calling for Anne Sacoolas to return to the UK and the Duke of York – who has not been summoned by police – to face questioning from the FBI in the US.
The 19-year-old was killed when his motorbike crashed into a car outside a US military base in Northamptonshire in August last year.