As Prince Harry and Meghan Markle's royal wedding edges ever closer, more and more members from the bride-to-be's family are making their way out of the woodwork.
And this time around, it's her former brother-in-law -- Scott Rasmussen.
Speaking with The Mirror, Scott, who's divorced from Meghan's half-sister, Samantha Grant, warned the newly-engaged duo not to invite his former partner to their wedding on May 19.
"Harry and Meghan need to know the truth about her. She's the last person who should be at Windsor Castle," the 59-year-old told the publication. "In my opinion, if she sets foot in the UK, they should send her straight to the Tower of London... She should act with some dignity, keep her mouth shut, and leave everybody else alone."
Samantha, 53, is the brains behind the soon-to-be published book titled The Diary of Princess Pushy's Sister.
"Samantha's the pushy one. She made our marriage a living hell. I believe she resented Meghan because she had the life Samantha always wanted and she was jealous," he continued.
"She only got bit parts. She tried being a model but it didn't work out," he explained, referencing her attempt to pursue a career in entertainment. "She got bitter."
Scott, a former Marine who's now a movie firearms expert, also said the mother-of-three was not nearly as close to the Suits actress during her childhood as she's claimed.
"Samantha making out they were close is bulls---," he said.
The pair were born 17 years apart to the same father, Thomas Markle Sr.
During a recent appearance on A Current Affair, Samantha said she was "never bitter or jealous" of Meghan's success and instead insisted that she was proud of her.
She also accused the royal-to-be of not doing enough to help their father, who declared bankruptcy in 2016 and now lives in Mexico.
"Honestly — what she could spend in a weekend would greatly help dad, so that should be a priority," Samantha said.
Speaking directly to her half-sibling, she continued: "I think you need to step up to the plate and make sure he is well taken care of."
Samantha, who has multiple sclerosis and has been wheelchair-bound for more than 10 years, went on to reference a specific designer dress worn by the duchess-to-be in her official engagement photos.
"If you can afford $75,000 for a dress, you can afford $75,000 to help your dad. That's how I feel, that's who I am," she said.
WATCH: Samantha describes her relationship with the bride-to-be. Post continues...
Harry, 33, and Meghan, 36, will tie the knot at St. George's Chapel at Windsor Castle on Saturday, May 19.
As Kensington Palace recently announced, following the ceremony, the newlyweds will undertake a tour of the town as their first trip as man and wife to greet well-wishers from all over the world who have come to see them.
It will no doubt remind fans of similar scenes that played out during Prince William and Duchess Catherine's 2011 wedding.
WATCH: Relive the magic from Prince William and Duchess Catherine's wedding day. Post continues…
After the carriage procession, guests will gather inside St. George's Hall for a day-time reception.
In the evening, Harry and Meghan will mingle with their VIP guests at a private reception hosted by the groom's father Prince Charles.
According to sources speaking to the Daily Mail, it's believed the royal wedding will be divided into two segments -- an informal dinner for 350 and a reception drinks.
While there's no word yet on the guest list, the palace promised they'll share more details in due course.