Death of Harry Dunn
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?"
The 19-year-old’s family are set for a two-day judicial review hearing at the High Court in November where they allege the foreign secretary “obstructed justice”.
Harry's mother has made an emotional plea to the PM to make the case his "top priority" during the US secretary of state’s visit to the UK next week.
The US "are demonstrating an extraordinary amount of hypocrisy" with their Assange extradition bid, said a spokesperson for Dunn's family.
The family has called for a "full public enquiry into who knew what and when".
Several incidents of cars driving on the wrong side of the road near RAF Croughton have now been reported to police.
A family spokesperson said footage of a near-miss close to RAF Croughton had "sent shivers down my spine and made me feel sick."
A spokesperson for the family also said they were taking claims made by the Trump administration "with a pinch of salt".
The 42-year-old, who is married to a US intelligence officer, is accused of driving the car that hit and killed the Northamptonshire teenager.