Northamptonshire Police is sending officers to the US to interview the woman who claimed diplomatic immunity following her alleged involvement in the death of Harry Dunn.
The 19-year-old motorcyclist died when his bike crashed into a car driven by Anne Sacoolas outside RAF Croughton in Northamptonshire on August 27.
Family spokesman Radd Seiger said on Twitter: “Yesterday the family were told the police had passed their file to the CPS (Crown Prosecution Service) yet tonight were informed that the police were travelling to the USA to interview Mrs Sacoolas.
“Those two statements appear to be contradictory on the face of it, further compounding the family’s misery.”
Harry’s parents, Charlotte Charles and Tim Dunn, will on Tuesday meet with shadow foreign secretary Emily Thornberry, who is expected to call for a Parliamentary inquiry into the teenager’s death.
On Monday, Foreign Secretary Dominic Raab told the Commons he had commissioned a review into immunity arrangements for US personnel and their families at the RAF Croughton annex in light of the case.
Mr Raab said there are “no barriers to justice being done” for Harry.
He also said the UK Government believes diplomatic immunity “clearly ended” for Mrs Sacoolas, 42, when she left the country for America shortly after the crash.