Dunn’s parents want Sacoolas to return to the UK and cooperate with investigators. They hoped their trip to the US would bring attention to his tragic death, as media coverage in the US has been overshadowed by the impeachment inquiry.
“He was very, very special, big-hearted boy,” said his mother, Charlotte Charles, saying he had many friends and a keen “instinct to know when you needed an extra hug”.
“It was very hard to get mad with him,” she said, even when “you felt like you needed to sometimes – especially when he left his room in such a mess”.
Tim Dunn described him as an “accomplished” motorbike rider who would chat with his parents after a long workday, before going out for a ride.
When Dunn’s family accepted the White House invitation, they were neither informed it was a meeting with Trump nor that Sacoolas would be there in the next room – let alone that Trump would thrice urge them to meet with her, they said.
“It wasn’t actually until we were halfway there, I think, that we realized it was a senior official,” Charles recalled. “We just went with it. We didn’t really have any time to think about it.”
The parents of Harry Dunn have reached a "resolution" in a civil claim for damages with the woman alleged to have killed him, the family's spokesman has said.
Mr Dunn, 19, died when his motorbike was hit by a car driven by US citizen Anne Sacoolas near RAF Croughton, Northamptonshire, in 2019.
She later left the country, claiming diplomatic immunity.
Dunn family spokesman Radd Seiger said the outcome was "a real milestone".
Details of the agreement reached between the parties involved in the civil case have not been disclosed.
Mrs Sacoolas's car collided with the teenager's motorbike moments after she left the US base, where her husband Jonathan worked for a US intelligence agency.
The teenager's parents, Charlotte Charles and Tim Dunn, brought the civil claim against Mrs Sacoolas in the US state of Virginia.
Harry Dunn's family began the damages case against Anne Sacoolas to force her to give evidence about what happened, because it appeared to be the only way to get her into court.
But that was before the Biden administration assured London that it would not stand in the way of some kind of alternative process of achieving justice for Harry, providing Ms Sacoolas and British prosecutors could agree.
The Crown Prosecution Service is not downplaying what it says are the "challenges and complexity" of that proposal - but nor is it suggesting that it's hopeless.
"Restorative justice", in which someone accounts for their actions, is a feature of both the British and American criminal justice systems.
We don't know what prosecutors are considering - but Harry Dunn's family are clear: justice and truth must lie at the heart of whatever happens.