Meghan and Prince Harry's marriage 'toxic', her half-sister's …

Meghan Markle and Prince Harry have a "toxic relationship", Duchess' half-sister Samantha Markle said. Ahead of King Charles' coronation, Samantha Markle, her father and brother will give their "last ever interview" to Channel 7's Taylor Auerbach to share family videos and "an extraordinary message", they said.

Prince Harry-Meghan Markle: Prince Harry and Meghan Markle, Duke and Duchess of Sussex are seen.(AP)

In a clip for the interview, Samantha Markle shared her thoughts on her half-sister's romantic life. "They're really unhealthy for each other, it's a toxic relationship," she said as a video showed Meghan Markle and Prince Harry holding hands.

Broadcaster Taylor Auerbach announced the interview on Twitter as he shared the trailer. "WORLD EXCLUSIVE: This Sunday on ?@7NewsSpotlight - Meghan Markle as you've never seen her before. For the first time, the Markles unite with an extraordinary message on the eve King Charles III's coronation.

These hidden tapes will stun the world! Only on ? @Channel7," he wrote. The clip starts with a video of Meghan Markle being driven in a convertible wearing a tiara and prom dress.

"The world has never seen Meghan like this, the homecoming queen," the voiceover said. The clip then cuts to a shot of Taylor Auerbach speaking to the Markle family, as he says, "This will be your last interview ever." "Treasured memories, home truths and secret tapes are all coming out," the voiceover continues.

Samantha Markle can be then heard saying, "She would still be a waitress if it wasn't for dad" while Meghan's brother, Thomas Markle Jr, adds, "We're not going to go away.

This is going to change everything."

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