While Meghan Markle is living the royal life in Great Britain, her estranged half-sister, Samantha Grant, is going off the rails in a heated tweet storm against the new Duchess.

According to the Huffington Post, in a series of scathing tweets on her private and protected Twitter account, Grant targeted the former Suits actress for being "an embarrassment" and for ignoring her family.

"My father is not an embarrassment for loving his daughter! The Royals are an embarrassment for being so cold," she wrote on Tuesday. "You should be ashamed of yourselves @KensingtonRoyal."

Further commenting on the subject of their father, who has been pleading with Markle, through the media, to give him a chance, Grant added that "enough is enough." She even went so far as to stress that she would blame Markle if he were to pass away.

"How about you pay tribute to your own father?!" she continued. "Act like a humanitarian act like a woman! If our father dies I'm holding you responsible, Meg!"

Her random outburst came on the heels of their father, Thomas Markle, telling The Sun that he thought the Duchess of Sussex looked "terrified" to now be a part of the royal family. He also mentioned that she hasn't spoken with him since the day after the royal wedding.