Samantha Markle lashes out at half-sister Meghan's treatment of their father

Meghan Markle's half-sister has lashed out again, this time calling her famous sibling 'duchass' for her behaviour towards their father.

"I am not candy coating anything anymore! The DUCHASS should be human to our father who has given her everything. He was the one who was there for her," Samantha Markle, 53, writes on Twitter.

"Fake waves and smiles can stop. The duchASS can bow to the daddy."

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In an earlier tweet, Samantha takes aim at Meghan's public persona since becoming the Duchess of Sussex following her May 19 wedding to Prince Harry.

"People need to stop being so blinded by the glare of celebrity status and wealth," she says, before dragging US President Donald Trump into the mix.

"The same mentality applies to my sister. People believe anything and still follow in an ant line."

The public unravelling of Meghan Markle's family began shortly before the Royal Wedding, when Thomas Markle participated in staged paparazzi photos, with eldest daughter Samantha later confessing the idea had been hers.

In the leadup to the wedding, Meghan's estranged half-siblings - Samantha and Thomas Markle Jr - gave a number of scathing media interviews which have since continued.

To add insult to injury, the Duchess' own father then began giving interviews, accusing the Royal Family of "freezing" him out of his daughter's life.

She's previously called Meghan "Cruella Deville"

Samantha Markle, also known as Samantha Grant, lives in Florida in the US with her partner and children.