Meghan Markle's Sister To Release Documentary About Actress, Prince Harry Romance

Meghan Markle's half-sister, Samantha Grant, is releasing a documentary about their family.

Grant confirmed that she is set to release a documentary about the Markles, which will also touch on Meghan's high-profile romance with Prince Harry. "When Harry Met Meghan: A Royal Romance" will document the "Suits" star's relationship with Prince Harry and the "astonishing story of her ancestors." The film will air on Saturday, Oct. 28, on Channel 4, Elle reported.

"It's an all-American tale of humble origins and triumph over adversity played out in the Deep South on her mother's side and in the Appalachian Mountains of Pennsylvania on her father's side," the description read. "It traces the first moment her father's ancestors arrived in America, with some very surprising results about where they came from."

The film includes interviews with the "Remember Me" star's friends and colleagues. There are also excerpts from royal experts who talked about whether or not Markle is ready to be part of the British royal family.

"Growing up, Meghan Markle's world was very different to Prince Harry's: the leafy suburbs of LA, with both her parents involved in the film industry," the synopsis of the documentary read.

Despite theit differences, the actress and her beau are clearly working together to make their romance work, and Grant expressed her faith in them. "They can bring so much to their role in global outreach, as a part of the royal family and in their humanitarian efforts," Grant said in her recent interview with "Good Morning Britain" (via People).

Grant made headlines earlier this year when she threatened to release a tell-all book titled "The Diary of Princess Pushy's Sister." In her first interview, she said that Markle might not like what she had written about her. A number of their relatives reacted, including her daughter, who claimed that she is jealous of the actress. Meanwhile, Grant's own mom said that she has been "dogging [Meghan] for years."

However, during Grant's new interview with "Good Morning Britain," she seemed to have a change of heart and even described Markle as "very strong, very worldly, very educated, very graceful." She also explained that her book is not a "slamming tell-all."

Watch Grant's "When Harry Met Meghan: A Royal Romance" on Saturday on Channel 4.