'1000-Lb Sisters' Tammy and Amy Slaton Learn Surprising New Detail About Their Genealogy

Tammy and Amy Slaton have learned a brand new detail about their family tree.

In the newest episode of their TLC series 1000-Lb Sisters, the two reality stars sat down with a genealogist in the hopes of getting more information about the ancestors that came before them.

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After already learning that one of their relatives was wounded in the American Revolution in the 1700s, Amy and Tammy—as well as their brother Chris—were clued in on yet another shocking tidbit about their family history.

While sitting down with the family—including Amy and Tammy's siblings, Amanda and Misty—the genealogist said, "I have a great story tell to you," about his findings.

"In order to come back to family here [in London], we had to go almost 500 years back," he explained, before naming one of their ancestors, Sir Thomas Clark, who was born in the 1520s.

Since their ancestor's name included "Sir," the genealogist said that means Sir Thomas Clark was a knight.

"Finding out that there's a knight in the family, it's cool as s—t," Chris said in his confessional interview while admitting, "I've always wanted to put on a knight's armor and clink around."

But Tammy, 38, wanted to know if she and her siblings are in any way related to the royal family in the U.K., even though Chris said that sounded like a "croc of s—t."

While the genealogist said they haven't found any proof of their royal heritage yet, he also said, "But to be a knight, he probably came from nobility at one point."

"He may well have been royalty," he added.

Later in their confessional, Tammy and Amy, 37, discussed the new findings, with Amy stating, "I knew we had some big heads for a reason."

"Speak for yourself," Tammy fired back.

New episodes of 1000-Lb. Sisters air on Tuesdays at 9 p.m. ET on TLC.

Next: 1000-Lb Sisters Stars Tammy Slaton Responds to Backlash Over Her "Mean" Behavior Toward Sister Amy