Floyd Mayweather Sr. is now joining in on the 50 Cent vs. Floyd Mayweather Jr. feud.

TMZ reports, during an interview on Fox Sports 670 Las Vegas, Mayweather Sr. challenged 50 Cent to fight his son in the boxing ring.

In the interview audio clip obtained by TMZ, Mayweather Sr. addresses the most recent feud between 50 Cent and Floyd Mayweather Jr. over Jr.'s alleged illiteracy.

"50 Cent seems like he's got a problem since Floyd left him. He's a world known singer and he's acting like a kid," Mayweather Sr. says about the duo's latest feud.

Last week, 50 Cent put his own spin on the ALS challenge and challenged Mayweather Jr. to read a page from a "Harry Potter" book or "The Cat in the Hat" in exchange for 50's donation to a charity of Mayweather Jr.'s choice.

"Floyd will you except my ALS/ESL CHALLENGE: I will donate $750K to a charity of your choice, if you can read a full page out of a Harry Potter book out loud without starting and stopping or F**king up lmao," 50 Cent captioned his Instagram video.

Later in the week, 50 continued to throw jabs at Mayweather Jr. by way of Instagram memes he posted all over his Instagram account.

Check out some of 50's Instagram memes below.

Despite the embarrassing memes, 50 eventually came forward earlier this week and revealed that Mayweather Jr. can actually read.

"Champ can read. He can read," 50 told Angie Martinez during his Power 105.1 interview. "I don't want to hurt him, but he do things that agitates me. He do things to aggravate me a little bit. I look at him like my little brother too, but he'll pick at you like, 'You ain't bigger than me.'"

However, Mayweather Jr.'s father refuses to accept 50's halfway apology and announced on air that his son, who weighs less than 50, would beat him regardless of size.

"He weighs over 100 pounds more than Floyd. Let him go up against Floyd ... put that on video. Floyd would stop all that. Wouldn't be no more said," Mayweather Sr. said.

50 Cent has yet to respond.

Will 50 Cent accept Floyd Mayweather Sr.'s challenge? Share your comments below.