Woody Harrelson and Matthew McConaughey, who says his mom started the rumor that he and Harrelson may be half-brothers.Photo:Dave Benett/GettyMatthew McConaugheyknows who’s at the root of thoseWoody Harrelsonbrother rumors.During an appearance onAccess DailyTuesday, host Kit Hoover asked the Oscar winner, 53, whathis mom Kaythinks of the theory that he and costar pal Harrelson, 63,might be half-siblings.“What does K-Mac have to say about this?” the host asked, to which McConaughey responded: “She’s the one that started this whole thing!”“We’re all sitting around in Greece one night talking and my mom out of nowhere in a little pause goes, ‘Oh, I knew your dad, Woody…,’ ” the actor said.He continued, “And we all went, ‘What was the ellipsis about? And what was theknewabout?’ And she goes, ‘Just saying, we might have frequented the same similar place out in West Texas one time when he was on furlough.' ”“And we all went, ‘What? What, are you going to leave it there?’ ” he continued. “Now we gotta go do some DNA tests.”McConaughey first brought up his and Harrelson’s potential connection onLet’s Talk off Camera with Kelly Ripain April while teasing their aptly-named projectBrother from Another Mother.“Where I start and where he ends and where he starts and I end has always been a murky line, and that’s part of our bromance, right?” he told host Kelly Ripa at the time. “My kids call him Uncle Woody, his kids call me Uncle Matthew.“McConaughey continued, “My family thinks a lot of pictures of him are me, his family thinks a lot of pictures of me are him,” before sharing the story of the Greece revelation with Ripa, 52.According to McConaughey, the timeline also appears to match up — it’s possible his mom “knew” Harrelson’s dad during a time when she was separated from husband James Donald McConaughey.Matthew McConaughey and his mom, Mary Kathleen McCabe.Gregg DeGuire/FilmMagicWhile the two may take a DNA test sometime in the future, theDallas Buyers Clubactor told Ripa it would be “a little harder” for him than Harrelson.“It’s a little easier for Wood to say, ‘Come on, let’s do it,' because what’s the skin in it for him?” he said. “It’s a little harder for me because he’s asking me to take the chance to go, ‘Wait a minute,you’re telling me my dad may not be my dad of 53 years,' and believe in it?”“I got a little more skin in the game,” he added.Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.From left: Camila Alves McConaughey, Matthew McConaughey, Kay McConaughey.SUZANNE CORDEIRO/AFP via Getty ImagesShortly after McConaughey’s chat with Ripa, Harrelson discussed their potential brotherhood onThe Late Show with Stephen Colbert— andechoed his longtime pal’s hesitation about taking a DNA test.“The thing is, we want to go for a test, but for him, it’s a much more big deal,” he said of McConaughey. “I mean, he feels like he is losing a father. But I’m like, ‘No, you’re gaining a different father and a brother.’ “McConaughey and Harrelson first teamed up for the 1999 satire filmEDtv. They have since reunited onscreen for the 2008 comedy filmSurfer, Dudeand in the first season of HBO’sTrue Detective.

Woody Harrelson and Matthew McConaughey, who says his mom started the rumor that he and Harrelson may be half-brothers.Photo:Dave Benett/Getty

Woody Harrelson and Matthew McConaughey attend the launch party of new bar The Parrot at The Waldorf Hilton hosted by Idris Elba on November 8, 2018 in London, England

Dave Benett/Getty

Matthew McConaugheyknows who’s at the root of thoseWoody Harrelsonbrother rumors.During an appearance onAccess DailyTuesday, host Kit Hoover asked the Oscar winner, 53, whathis mom Kaythinks of the theory that he and costar pal Harrelson, 63,might be half-siblings.“What does K-Mac have to say about this?” the host asked, to which McConaughey responded: “She’s the one that started this whole thing!”“We’re all sitting around in Greece one night talking and my mom out of nowhere in a little pause goes, ‘Oh, I knew your dad, Woody…,’ ” the actor said.He continued, “And we all went, ‘What was the ellipsis about? And what was theknewabout?’ And she goes, ‘Just saying, we might have frequented the same similar place out in West Texas one time when he was on furlough.' ”“And we all went, ‘What? What, are you going to leave it there?’ ” he continued. “Now we gotta go do some DNA tests.”McConaughey first brought up his and Harrelson’s potential connection onLet’s Talk off Camera with Kelly Ripain April while teasing their aptly-named projectBrother from Another Mother.“Where I start and where he ends and where he starts and I end has always been a murky line, and that’s part of our bromance, right?” he told host Kelly Ripa at the time. “My kids call him Uncle Woody, his kids call me Uncle Matthew.“McConaughey continued, “My family thinks a lot of pictures of him are me, his family thinks a lot of pictures of me are him,” before sharing the story of the Greece revelation with Ripa, 52.According to McConaughey, the timeline also appears to match up — it’s possible his mom “knew” Harrelson’s dad during a time when she was separated from husband James Donald McConaughey.Matthew McConaughey and his mom, Mary Kathleen McCabe.Gregg DeGuire/FilmMagicWhile the two may take a DNA test sometime in the future, theDallas Buyers Clubactor told Ripa it would be “a little harder” for him than Harrelson.“It’s a little easier for Wood to say, ‘Come on, let’s do it,' because what’s the skin in it for him?” he said. “It’s a little harder for me because he’s asking me to take the chance to go, ‘Wait a minute,you’re telling me my dad may not be my dad of 53 years,' and believe in it?”“I got a little more skin in the game,” he added.Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.From left: Camila Alves McConaughey, Matthew McConaughey, Kay McConaughey.SUZANNE CORDEIRO/AFP via Getty ImagesShortly after McConaughey’s chat with Ripa, Harrelson discussed their potential brotherhood onThe Late Show with Stephen Colbert— andechoed his longtime pal’s hesitation about taking a DNA test.“The thing is, we want to go for a test, but for him, it’s a much more big deal,” he said of McConaughey. “I mean, he feels like he is losing a father. But I’m like, ‘No, you’re gaining a different father and a brother.’ “McConaughey and Harrelson first teamed up for the 1999 satire filmEDtv. They have since reunited onscreen for the 2008 comedy filmSurfer, Dudeand in the first season of HBO’sTrue Detective.

Matthew McConaugheyknows who’s at the root of thoseWoody Harrelsonbrother rumors.

During an appearance onAccess DailyTuesday, host Kit Hoover asked the Oscar winner, 53, whathis mom Kaythinks of the theory that he and costar pal Harrelson, 63,might be half-siblings.

“What does K-Mac have to say about this?” the host asked, to which McConaughey responded: “She’s the one that started this whole thing!”

“We’re all sitting around in Greece one night talking and my mom out of nowhere in a little pause goes, ‘Oh, I knew your dad, Woody…,’ ” the actor said.

He continued, “And we all went, ‘What was the ellipsis about? And what was theknewabout?’ And she goes, ‘Just saying, we might have frequented the same similar place out in West Texas one time when he was on furlough.' ”

“And we all went, ‘What? What, are you going to leave it there?’ ” he continued. “Now we gotta go do some DNA tests.”

McConaughey first brought up his and Harrelson’s potential connection onLet’s Talk off Camera with Kelly Ripain April while teasing their aptly-named projectBrother from Another Mother.

“Where I start and where he ends and where he starts and I end has always been a murky line, and that’s part of our bromance, right?” he told host Kelly Ripa at the time. “My kids call him Uncle Woody, his kids call me Uncle Matthew.”

McConaughey continued, “My family thinks a lot of pictures of him are me, his family thinks a lot of pictures of me are him,” before sharing the story of the Greece revelation with Ripa, 52.

According to McConaughey, the timeline also appears to match up — it’s possible his mom “knew” Harrelson’s dad during a time when she was separated from husband James Donald McConaughey.

Matthew McConaughey and his mom, Mary Kathleen McCabe.Gregg DeGuire/FilmMagic

Camila Alves, Matthew McConaughey and mom Mary Kathleen McCabe arrive at the Los Angeles Premiere of “The Lincoln Lawyer” at the ArcLight Hollywood on March 10, 2011 in Hollywood, California

Gregg DeGuire/FilmMagic

While the two may take a DNA test sometime in the future, theDallas Buyers Clubactor told Ripa it would be “a little harder” for him than Harrelson.

“It’s a little easier for Wood to say, ‘Come on, let’s do it,' because what’s the skin in it for him?” he said. “It’s a little harder for me because he’s asking me to take the chance to go, ‘Wait a minute,you’re telling me my dad may not be my dad of 53 years,' and believe in it?”

“I got a little more skin in the game,” he added.

Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

From left: Camila Alves McConaughey, Matthew McConaughey, Kay McConaughey.SUZANNE CORDEIRO/AFP via Getty Images

Actor Matthew McConaughey (C), his wife Camila Alves (L) and his mother Mary Kathlene McCabe (R) attend the premiere of “The Beach Bum”

SUZANNE CORDEIRO/AFP via Getty Images

Shortly after McConaughey’s chat with Ripa, Harrelson discussed their potential brotherhood onThe Late Show with Stephen Colbert— andechoed his longtime pal’s hesitation about taking a DNA test.

“The thing is, we want to go for a test, but for him, it’s a much more big deal,” he said of McConaughey. “I mean, he feels like he is losing a father. But I’m like, ‘No, you’re gaining a different father and a brother.’ "

McConaughey and Harrelson first teamed up for the 1999 satire filmEDtv. They have since reunited onscreen for the 2008 comedy filmSurfer, Dudeand in the first season of HBO’sTrue Detective.

source: people.com