Another part of Anna and Lucy's, well, extreme relationship is the fact that they're both with the same man, Ben Byrne. The Australian sisters got engaged to Ben in Season 1 of Extreme Sisters and the trio has been together for 11 years.

So far, however, they have been unable to legally get married, since bigamy is a criminal offense in Australia.

In 2021, the sisters spoke with PerthNow to open up about being part of the show and how they feel they are the show, in a way. While that's certainly up for debate, the sisters also shared details about Ben and what he thinks of his two fiancées being on reality TV.

"He was the one who really wanted us to do this show," Lucy told the outlet. "People were waiting to hear his voice, his views, and what it's like living with two girlfriends. Ben is such a chilled guy, he's not really like 'look at me, I've got two girlfriends.' He just loves us for who we are."

They've also shared on the show how unfair they believe it is that they can't get married to Ben at the same time. But, like a dual pregnancy, Lucy and Anna don't seem to be giving up on their dream marriage any time soon.

Watch Extreme Sisters on Mondays at 9 p.m. EST on TLC.