Luke asked if the half-siblings had been close before that, with Thomas claiming they were, but they hadn’t spoken since then.
“She stopped [talking] as soon as she… I mean, you know that’s like the big thing now, is like what happened to her? … Nobody can figure it out,” Thomas explained, as sad music played in the background.
“Money changed her, I guess. Money and fame just went to her head really bad,” he claimed.
If that weren’t harsh enough, Thomas had more to get off his chest.
“The thing that gets to me is like, the guy that she was married to the first time, Trevor … this guy just took care of her … she [was] adored by him.
“She just walked all over him and dumped him. After being married, sent the ring back in the mail. Is that cold or what?" he continued.
“Harry’s next. Harry’s on the chopping block next.”
“The only difference between now and then was like all the photos from prior to that, he had a smile on his face. All the ones after, he doesn’t.”
Fans were not having it.
“Imagine your claim to fame being talking trash about your sister. 😍” one commented on Instagram.
“This guy is full of it, he's so far from being close to royalty,” another shared.
“If you were so close why are there no photos of you guys together? LOL,” a third pointed out.
WATCH BELOW: Thomas Markle Jr. to appear on Big Brother VIP. Story continues below.
Thomas is infamous for his regular public commentary of Meghan Markle, who now lives in Los Angeles with her husband, Prince Harry, after the pair split from the British Royal Family.
He has long held this opinion of Meghan, and has publicly called her a ‘phony’ who ‘turned into a different person’ and ‘forgot her roots and her family’ since becoming famous.
His dislike ran so deep that he even penned a letter to Prince Harry, asking him to call off their 2018 wedding, in which he called her a ‘jaded, shallow, conceited woman'.
It’s worth noting that Meghan and Thomas hadn’t seen each other for about seven years by this point, by Thomas’ own account.
He later sent a follow-up letter to apologise for ‘venting his frustrations’ in the wake of not being invited to the wedding.
Since Thomas’ only claim to fame is that Meghan is his half-sister, we expect to hear a bit more from him before he’s (hopefully) booted from the Big Brother House.