Meghan Markle's estranged father Thomas believes the silence from the Sussexes is 'unusual.'
Mr Markle, 79, who fell out with daughter Meghan when he suffered two heart attacks on the eve of her 2018 wedding to Prince Harry and was unable to walk her down the aisle, said: 'Another letter? Again?'
Meghan wrote her father a five-page letter after her wedding. The existence of the letter was 'leaked' to People magazine by five of her friends six months later.
Mr Markle said: 'Here we have another letter from my daughter which has somehow made it into the public domain. Another letter? Again? The fact that Harry and Meghan have not publicly distanced themselves from this strikes me as unusual.'
Meghan Markle's estranged father has branded the Sussexes' silence over the Scobie book furore as 'unusual'
Thomas Markle has repeatedly appealed to Meghan to allow him to see his grandchildren
Omid Scobie's book Endgame caused controversy after two royals identified by Meghan as having expressed concerns over her future son's skin colour were named in the Dutch edition
Meghan sued the Mail on Sunday after this newspaper published excerpts of the letter to her father.
Mr Markle suffered a devastating stroke last year and still struggles to talk.
He has repeatedly appealed to Meghan to allow him to see his grandchildren, four-year-old Archie and Lilibet, two, but has not heard from her even though her home in Montecito is around a five-hour drive from his house in Rosarito, Mexico.