The father went on to discuss the arrival of Lilibet, lamenting that he may never get to see his granddaughter.
"There’s a good chance that I might never see my grandchildren. I’m not looking for pity. I’m just saying that’s a reality."
The 76-year-old also suggested that the radio silence he was receiving from his daughter was "cold" and that "it's even more cold to do it to the Queen".
This isn't the first time Thomas has spoken out about his daughter and son-in-law. Following Harry and Meghan's famous interview with Oprah Winfrey, the 76-year-old appeared on Good Morning Britain to take aim at the couple.
The scorned father revealed that ahead of Meghan and Harry’s royal wedding in 2018, he received a call from Harry while he recovering from a heart attack.
“Harry had said to me, ‘If you had listened to me, this wouldn’t have happened to you,’” Thomas, who pulled out of the wedding at the 11th hour due to his heart problems, said.
“Me, laying in a hospital bed after having a procedure, I had a stent put here and put here and that was kind of snotty so I hung up on him.”
WATCH BELOW: Thomas Markle "embarrassed" by Prince Harry and Meghan Markle
In 2018, after Thomas staged paparazzi photos of himself ahead of Meghan and Harry’s wedding, the Duchess announced that the now 76-year-old would no longer be walking her down the aisle on her big day.
Since then, the pair’s rocky relationship has been well documented.
After the Daily Mail published an edited version of a private letter Meghan sent to her father in 2019, urging him to stop victimising her, the former actress filed a lawsuit against Associated Newspapers for the breach in privacy.