Meghan Markle's half-sister, Samantha Grant has been publicly criticizing her sister and accusing her of being selfish and unkind to her family.

Ever since Meghan Markle started dating Prince Harry, her estranged half-sister Samantha Grant has been publicly criticizing the Suits actress and accusing her of being selfish and unkind to her family.

Now, she has revealed that she will be writing a tell-all book to reveal more about her much younger half-sister and according to reports, her motives are far from innocent.

According to E! News, Meghan, 35, and Samantha, 52, grew up separately, despite sharing the same father. Because of the 17-year age gap and the fact that they had separate mother, they were never raised in the same house so Samantha cannot claim to know Meghan well enough to tell her story.

"Samantha Grant doesn't have a relationship with Meghan Markle and she never has," the source told E! News. "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 also revealed that Samantha is simply coming out with lies now that Meghan and Prince Harry are an item because she wants to take advantage of her sister. They went on to reveal that during the very limited contact that Meghan has had with Samantha, she was nothing short of nice to the woman and most of those meetings happened when Meghan was only a child. 

Samantha Grant who suffers from multiple Sclerosis and is now wheelchair bound recently changed her name from Grant back to Markle and it’s all because she suddenly wants to identify with Meghan who could soon become a British aristocrat.

“Recently Samantha changed her name from Samantha Grant to Samantha Markle. If she hates Meghan so much, why is she suddenly trying to share an identity with her?" the source mused.

The insider continued,

 “Meghan was raised as an only child and split her time between her parents' homes. Her parents were divorced when she was 1-and-a-half years old and she largely lived with her mom though her parents had an extremely amicable relationship and co-parented often, having Sunday supper and taking vacations together. 

"Samantha was not a part of that life and in no way shape or form did Samantha raise Meghan until she was 12. Meghan saw her on occasionally at family functions but never on a regular basis. For about two weeks when Meghan was 12, Samantha moved in with her dad (and Meghan was still splitting time between homes). She has seen her once since then. It's been 23 years.”

Grant has spoken out on Twitter about her book and Markle, tweeting, "Maybe when she is more mature and she reads the book she'll understand some of it. She won't like some of it she might [sic]."