Updated

Meghan Markle’s estranged half-sister Samantha Grant is set to release a tell-all book – spilling family secrets and reportedly detailing the royal ambitions of Prince Harry’s lover.

Meghan’s 51-year-old half-sister is sharing her memoirs and says her 35-year-old sister should brace herself for some home truths.

“My book deals with my bi-racial family in a candid, warm, personal and socially important way,” Samantha told 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,” she added.

It has been reported by the Daily Star that the working title for Samantha’s book is “The Diary of Princess Pushy’s Sister.”

Meghan – who stars on TV legal drama Suits and was previously married to actor Trevor Engelson between 2011 and 2013 – is rumored to be close to becoming engaged to 32-year-old Prince Harry.

Click here for more on this story from The Sun.