They're the trash-talking YouTubers that have taken the boxing world by storm.
Jake Paul has called out every combat sports athlete under the sun following his knockout win over Nate Robinson.
And older sibling Logan just announced he'd be taking on one of the greatest boxers of all-time Floyd Mayweather in a one-off exhibition bout.
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Jake and Logan Paul clearly aren't afraid of fighting anyone - including each other.
Speaking in an interview with TMZ Sports, 23-year-old Jake didn't exactly shy away when asked if he'd lace up the gloves to throw-down his own brother.
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"I change my mind on that every day," he said.
"One day I'd wake up and do it and the next I'd think 'Ahh I don't think we should do that'. But we'll see - we'll see if that actually ends up happening.
"I would just do it to prove people wrong. Everyone is like 'Jake is the little brother, Logan would win' but really I'm a 10 times better boxer.
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And when asked if he would knock out his brother, Jake simply said: "If we fought then yes.
"Look, I've had two fights and I've been in the ring for a total of seven minutes and I've knocked down my two opponents six times in that time.
"A lot of people underestimate my punching power, they don't actually understand how hard I hit."
Boxing royalty the Klitschko brothers famously said they'd never fight each other.
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And if you asked UFC icon Nick Diaz if he'd ever trade blows with Nate then he'd probably slap you in the face.
But it seems not even their own blood will stand in the way of a pay day for Paul brothers.
Featured Image Credit: Instagram/@jakepaulTopics: Logan Paul, Boxing News, Boxing, Jake Paul, Australia, YouTube, Floyd Mayweather