In an interview with journalist Jay Beecher, Ghislaine Maxwell’s brother Ian said: “I suppose we are never really going to know because it’s Prince Andrew and it’s all been swept away. However this is the Jubilee year of his mother, he is a dutiful son. This really causes her hurt, it’s obvious it would any mother.
“It causes her immense pain.
“He’s just exceptionally embarrassed he doesn’t want to do anything to upset the year.
“I think that he had to fold his tent, really and do the best he could by the Crown.”
The interview comes after Prince Andrew paid out an estimated £12 million last month to Ms Giuffre in a settlement.
Ms Giuffre alleges she was recruited to have sex with the Duke of York when she was then just 17, by Ghislaine Maxwell and Jeffery Epstein.
The Duke of York vehemently denies the claims made against him.
Mr Maxwell, aged 66, continued: “Do I think that he had gone the other way and given evidence?
“I don’t know, I think it would have been very difficult evidence for him to give.
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Mr Maxwell added: “I think he is very high profile target but we are just not going to know.
“I think it’s interesting that he ended up paying what seemed a very large amount of money to her non-profit organisation and that’s unusual.”
The news comes as the Duke of York’s daughters could lose the ability to become full-time working members of the royal family, because of the prospect of a slimmed-down monarchy.
Royal expert Richard Fitzwilliams told the Daily Mirror: “We hear talk of the slimmed-down monarchy but there are tremendous advantages – especially for royals involved with charity. Would they want to? I’m not sure they would.
“They are both happy, have families and also have a good work/life balance. I think, regardless, their names are automatically linked to their father. It’s unavoidable.”