Meghan's sister Samantha Markle has Twitter account suspended after alleged misinformation and 'hacking'

Samantha Markle's legal team says its investigating a possible hacking of her social media amid claims it was used to spread misinformation about her estranged sister, the Duchess of Sussex.

As a consequence, one of the Twitter accounts used by Markle was suspended for alleged violation of the platform's rules.

In a statement to Newsweek Twitter said: "We suspended the account due to ban evasion".

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Markle previously tweeted from @TheMarkleSammy but the account was showing a suspension notice on March 14 which stated: "Account suspended. Twitter suspends accounts which violate the Twitter Rules."

The rule is designed to stop users getting around past enforcement action by creating new accounts and also applies to third parties who create accounts posing as the suspended individual.

She was previously suspended under another account, @sammy_markle, used to criticise Meghan.

Markle's Twitter suspension follows an article published by BuzzFeed claiming the account was used to post conspiracy theories about the duchess and her children, Archie and Lilibet.

She has denied the claims and is now threatening legal action against BuzzFeed.

Markle's lawyer Douglas A. Kahle told Newsweek: "Samantha's Twitter account appears to have been hacked; someone changed her password; and some of the Twitter screenshots that have appeared in the media very recently appear to have been altered or Photoshopped.

"However, due to the urgency of this matter, we are still investigating."

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In early March it was revealed Markle was suing the Duchess of Sussex over what she claims are "false and malicious lies" about her fairy tale "rags-to-royalty" story.

In her defamation case, Markle is seeking $75,000 ($101,000 AUD) in damages over Prince Harry and Meghan's interview with Oprah Winfrey and the book Finding Freedom.

Markle alleges the contents of both subjected her to "humiliation, shame and hatred on a worldwide scale".

Meghan, she claimed, "used the powerful resources of the royal family's public relations operation to disseminate and spread lies worldwide".

Lawyers representing the Duchess of Sussex have called the lawsuit "baseless and absurd", and a "continuation of a pattern of disturbing behaviour".

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Meanwhile Meghan's father Thomas Markle says he would be "thrilled" to defend Markle's claims in court.

"I would be more than happy to," Thomas, 77, said.

"I've been trying for almost four years to get to see my daughter and her ginger husband in a courtroom face-to-face. I'd be thrilled to defend my oldest daughter.

"[Meghan] can't defend the things she said."

Thomas made the comments in a newly-launched YouTube channel and podcast he's hosting with friend and celebrity photographer Karl Larsen.

The channel is expected to be a weekly discussion about news and current affairs with the debut episode focusing on Prince Harry and Meghan.

Thomas brought up the royal wedding and said Harry should have personally asked him for permission before marrying Meghan.

"I thought the royals had some kind of sense of dignity where he would have taken the time to fly down and see me," Thomas said.