Matthew McConaughey recently revealed that he and Woody Harrelson might be half-brothers, though the two haven’t taken a DNA test yet. Learn more about their possible biological connection below.

Matthew McConaughey and Woody Harrelson might be even closer than they think.

After all, the Dallas Buyers Club actor recently caused a stir with the jaw-dropping revelation that he and his longtime friend Woody could actually be related as half-brothers. Until now, Matthew believed he was born to Mary McCabe and James McConaughey in 1969, whereas Woody was born to Diane Oswald and Charles Harrelson in 1961. However, Matthew is questioning whether Charles, who died in 2007, might have been his father, too.

“Where I start and where [Woody] ends, and where he starts and I end, has always been like a murky line,” Matthew said in an April 11 episode of the Let’s Talk Off Camera with Kelly Ripa podcast, per Variety. “And that’s part of our bromance, right? My kids call him Uncle Woody. His kids call me Uncle Matthew. And you see pictures of us and my family thinks a lot of pictures of him are me. His family thinks a lot of pictures of me are him.”

Their similarities were further brought into question when Matthew’s mom, a 91-year-old author, dropped a bombshell that she knew Woody’s dad, who was a convicted hitman.

“In Greece a few years ago, we’re sitting around talking about how close we are and our families,” Matthew added. “And my mom is there, and she says, ‘Woody, I knew your dad.’ Everyone was aware of the ellipses that my mom left after ‘knew.’ It was a loaded K-N-E-W.”

The eyebrow-raising comments prompted a family investigation into the matter.

“We went on to unpack what this ‘knew’ meant and did some math and found out that [Woody’s] dad was on furlough at the same time that my mom and dad were in their second divorce,” Matthew explained. “Then there’s possible receipts and places out in West Texas where there might have been a gathering, or a meeting, or a ‘knew’ moment.”

Matthew and the Hunger Games alum have not yet taken a DNA test to settle the matter once and for all, and it looks like it might not happen anytime soon.

“Look, it’s a little easier for Woody to say, ‘Come on, let’s do [DNA tests],’ because what’s the skin in it for him?” Matthew said. “It’s a little harder for me because he’s asking me to take a chance to go, ‘Wait a minute, you’re trying to tell me my dad may not be my dad after 53 years of believing that?’ I got a little more skin in the game.”

For more stars who share a familial connection, keep reading…