Meghan Markle
Actress Meghan Markle attends the USA Network and The Moth's Characters Unite Event at the Pacific Design Center in West Hollywood, California, February 15, 2012. Reuters/Phil McCarten

Meghan Markle's estranged half-sister Samantha Grant has been in news since she announced she will write a book. Though it is still not clear if the book will be about her relationship with the “Suits” actress or other issues, Grant has slammed tabloids on her social media account for accusing her of being jealous of Prince Harry's girlfriend.

“My book is not boring hint hint.. can reveal yet you just gotta read it and see,” she said in one of her many tweets about the book. “It's not embarrassing or slamming you'll just have to wait and see!” she wrote in another tweet. The book will reportedly be titled “The Diary of Princess Pushy's Sister,” many publications revealed, assuming it will detail accounts of Markle and other unknown stories about her.

However, when Australian radio host Kyle Sandilands talked to Grant regarding the content of the book, she denied outright that it was about Markle. “The book is more about my biracial evolution after my birth out of the sixties. I wanted to make a mark in history and literature -if you will - with my own biracial experiences, it's all positive,” she told Sandilands during the Kyle And Jackie O Show last week. However, the radio jockey slammed Grant and humiliated her by saying that she should not use her sister's name to “trick media organisations into pushing your sh*t book!”

When questioned about the title, “The Diary of Princess Pushy's Sister,” Grant confessed that she chose to make the “title controversial and opposite to the theme of the book for a strategic reason.” It is not sure when the book will be released. Grant has openly admitted on her social media account that the writing concerns her personal life, not a “tell-all” as perceived.

An online search reveals how Grant and Markle are related because they have the same father, Thomas Markle. Grant is the daughter of lighting technician Thomas, 72, who hails from Los Angeles, California, and his first wife Roslyn. Meghan is Grant's half-sister from their father's marriage to yoga teacher Doria, 60. According to E Online, Markle and Grant lived completely different lives despite sharing the same father.

"Samantha Grant doesn't have a relationship with Meghan Markle and she never has," the source told the website. "As they were 17 years apart, they were never raised in the same house. Meghan was raised an only child by her loving parents." The source added that it has been more than two decades since the two last saw each other.