Meghan Markle has been challenged by her half-sister, Samantha Markle, to take a lie detector test. Her dad, Thomas Markle Sr., may also face legal action for explosive the private letters the Duchess of Sussex wrote to him months ago.

While speaking with Daily Star, Samantha responded to Markle’s claim that she barely knew her half-sister. She said that this was a lie, and it was also a lie to say that Prince Harry’s wife was never close to their dad.

“If pointing out that what she says are all lies breaks your heart, too bad because what I’m saying is the truth. I would challenge her to take a lie detector test anywhere on the planet with investigators that are not paid by her to skew the results,” Samantha said.

Earlier this week, Samantha also went on a Twitter rant against her half-sister. She said that if she had $600 million, the Duchess of Sussex may care about her.

Meanwhile, The Telegraph recently reported that Thomas may face legal action for making his daughter’s private letters public. The publication said that under British law, Markle is believed to have ownership of the copyright of the letter which was published.

The publication also claimed that the palace is considering whether or not they will take legal action over the matter, and Markle is also taking legal advice on whether or not she should take formal action.

In related news, Markle’s half-brother, Thomas Markle Jr., has also weighed in on the issue and said that their family’s issues are now broken beyond repair after what their dad did.

Days after the letter was released, Markle and Prince Harry went about their normal lives and were recently spotted at an official royal engagement. The couple attended the gala performance of “The Wider Earth” at the Natural History Museum in London on Tuesday night.

The event was done in support of Queen Elizabeth II’s Commonwealth Trust and Her Majesty’s Commonwealth Canopy project.