By Lisa Dowd, Midlands correspondent, and David Mercer, news reporter
The family of Harry Dunn will only meet the American woman involved in the crash that killed him if she agrees to return to the UK, their spokesman has told Sky News.
Radd Seiger said the condition was a "non-negotiable red line in the sand" as Harry parents, Charlotte Charles and Tim Dunn, arrived in New York in the hope of meeting Anne Sacoolas.
Mrs Sacoolas, the wife of a US diplomat, has previously said she wants to meet the pair to "express her deepest sympathies and apologies".
Harry, 19, died when his motorbike collided with a car outside an RAF base in Northamptonshire in August, before Mrs Sacoolas returned to America after being granted diplomatic immunity.
The Foreign Office says she no longer has diplomatic immunity because she has returned home.
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After Harry's parents arrived in New York, Mr Seiger told Sky News that the conditions for the potential meeting are yet to be agreed but it is hoped it will take place later this week.
"It's important to make clear, it's all about her coming back," he said.
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"For the family, the non-negotiable red line in the sand is that she must return to the UK and face the consequences and I'm awaiting a response to that.
"There's not much point in meeting and having pleasantries if that commitment isn't there."
After Mrs Sacoolas indicated she wanted to meet Harry's parents to apologise, the teenager's mother told Sky News that "sorry doesn't cut it".
"That's not really quite enough," Ms Charles said.
"But I'm still really open to meeting her, as are the rest of us. I can't promise what I would or wouldn't say, but I certainly wouldn't be aggressive."
Harry's parents had expressed anger and disappointment at how the UK government had handled the case following a meeting with Foreign Secretary Dominic Raab.
But on Saturday they received a letter from Mr Raab to say that Mrs Sacoolas no longer has diplomatic immunity, meaning the case could now be taken forward by Northamptonshire Police.
Detective Superintendent Sarah Johnson told Sky News that the force is working with the Crown Prosecution Service and other agencies to progress its investigation – even though the suspect is not in the UK.
"The driver that we are seeking did engage with us after the original collision," she said.
"After that original meeting on 28 August, we were advised that diplomatic immunity applied, which therefore prevented us from being able to otherwise progress the investigation."
