Meghan Markle's estranged father on Tuesday pleaded with his daughter to let him see his grandchildren.
"This is ridiculous, almost four years, it's crazy," he said.
He is yet to meet grandson Archie, born in 2019, or granddaughter Lilibet, who was born in June.
"My message for the kids is that they have two loving families," he said.
The 77-year-old Emmy-winning former lighting director was interviewed from his home in Mexico.
He claimed that Meghan, who became the Duchess of Sussex on marrying Prince Harry, had wanted him to stop talking to her step-sister and step-brother, "and I couldn't".
Ragland was at her wedding at Windsor Castle and has had tea with Queen Elizabeth II.
Thomas Markle declined to attend the wedding after he took part in staged paparazzi photos. He also cited forthcoming heart surgery. Meghan dropped contact with him soon after the wedding.
Harry and Meghan stunned the royal family last year when they announced they were stepping back from frontline royal duties.
They moved to Los Angeles, cutting financial ties with the royal family and signing a string of lucrative deals, including with the streaming giant Netflix, and Apple TV+.