Meghan Markle's sister is writing a tell-all book 'she won't like'

Watch out Meghan!

Meghan Markle's estranged half-sister Samantha Grant is set to release a tell-all book that reportedly details what it's like to grow up with the "Suits" actress as a child.

"My book deals with my bi-racial family in a candid, warm, personal and socially important way," Grant revealed to the Daily Star. "Maybe when Meghan is more mature and reads the book she'll understand. Some of it she won't like, some of it she might."

The working title of Grant's book, according to the Daily Star, is "The Diary of Princess Pushy's Sister."

Grant, 51, and Markle, 31, share the same father -- Tom Markle. Samantha revealed that while the Meghan always wanted to be a princess, her "behavior is certainly not befitting of a royal family member."

She also slammed the brunette beauty's relationship with Prince Harry, claiming Meghan "has a soft spot for gingers."

Grant hasn't kept her feelings hidden about her younger half-sister. Earlier this month, she went on a rant about Markle's latest trip to India:

There's no denying that brunette beauty's star status has skyrocketed ever since it was revealed that she's dating the prince, so the timing of the tell-all book is anything but a coincidence. Samantha and Meghan haven't talked in nine years, so the accuracy of the book has to be taken with a grain of salt.

The famous couple's relationship has been anything but slow. A Daily Mail report claimed that construction is currently underway for an apartment in Kensington Palace for Meghan and Harry.

"He seems in a real hurry to move in with Meghan," a source revealed.

Sources claim that Prince Harry could propose as early as this summer, so it's no surprise that he'd want to move in with her ASAP.