Royal titles for Prince Harry and Meghan Markle's children Archie and Lilibet "need to be earned", according to a source.
The late Queen's death saw the Sussex children move up in the line of succession and as the grandchildren of the new monarch King Charles, they have a right to be known as prince/princess and have HRH status.
But since coming to the throne almost five months ago, there has been no official announcement regarding their titles.
Since Charles's accession, Harry and Meghan have caused a stir after the release of their controversial six-part Netflix docuseries, where they have made several claims against the Royal Family, including that the King lied during the so-called Sandringham Summit.
In addition, Harry released his eagerly-anticipated memoir Spare last month, which was also highly critical of his father and gave details about highly private conversations and moments between the royals.
And now a source says this has had an affect on the decision regarding titles for Archie and Lilibet.
They told Vanity Fair : "The matter of titles is still up in the air.
"The feeling is that the titles need to be earned. The royals need to know that they can trust Harry and Meghan not to keep damaging the reputation of the family."
It comes as Charles reportedly wants Harry and Meghan to attend his coronation later this year - and he could offer them several incentives to come, according to a source.
It is said that His Majesty has approached the Archbishop of Canterbury Justin Welby over a potential agreement that would pave the way for his younger son and daughter-in-law to attend despite the recent fallout from Harry's memoir Spare.
Speculation over whether the pair would be present for the Westminster Abbey ceremony on May 6 - Archie's fourth birthday - has been present since Charles' ascent to the throne last year.
But now a source has told the Mail On Sunday that Harry could be offered a "high-profile seating position" for the ceremony as well as an assurance he can keep his titles as an "inducement" to attend.
A source told the newspaper: "Harry's camp made clear that the idea that he would just attend the Coronation and behave himself but then be stripped of his titles was a total non-starter.
'While he might decide at some point to discard his titles of his own volition, he objects to the idea of being forcibly stripped of them.
'He resents being lumped together with Andrew in the public mind as the two 'problem Princes' when he considers the circumstances to be totally different."