A meeting between the parents of Harry Dunn and the Archbishop of Canterbury has been cancelled because they are "struggling emotionally".
The pair were due to meet Most Rev Justin Welby at Lambeth Palace in London on Wednesday afternoon.
Family spokesman Radd Seiger made the announcement on Twitter and called on the CPS to charge US citizen Anne Sacoolas, 42, over the 19-year-old's death in a road collision in August.
On Tuesday the family of teenage motorcyclist said they have been given "hope" after meeting with the Foreign Secretary again to discuss the 19-year-old's death.
Harry's father Tim Dunn said their conversation with Dominic Raab at the Foreign and Commonwealth Office in London on Tuesday was more "open" and "friendly" than a meeting held in October.
"This meeting was a lot better. He was more engaging, he came across more honest," Mr Dunn said.
Harry was killed when his motorbike was involved in a head-on collision with a car outside RAF Croughton in Northamptonshire on 27th August.
The suspect in the case, 42-year-old Anne Sacoolas, claimed diplomatic immunity after the crash and was able to return to the US.
Harry's mother Charlotte Charles was not present on Tuesday after being left "utterly devastated" by watching footage of Mrs Sacoolas reversing out of her driveway in the state of Virginia.
