Muhammad Ali's Parkison's disease seems to be getting the best of the former world champion as the boxing legend's condition is reportedly getting worse.

Rahman Ali, 71, told UK Mirror's Sunday People during "I Am Ali in Hollywood" screening that Muhammad Ali's Parkinson's disease is taking his ability to speak.

"I have not been able to talk to my brother about this because he is sick," he said. "He doesn't speak too well. But he is proud that we are here for him. He has given this film his blessing."

Muhammad Ali's daughter Maryum, 46, also attended the screening where she told the publication:

"He has not seen the film yet, but I am very excited for him to see it. He is going to love it. I know he is. He is going to cry, he is going to laugh. He will be very proud."

According to Mirror, quoting the boxing legend's son Ali Jr., Muhammad Ali's Parkinson's diease would rob him of his father anytime soon as he said that his dad has a dim chance of surviving another year

"I just want, hope and pray to God that this awful disease takes my dad sooner rather than later. Take him away from all the suffering he's in," he said.

According to London's The Guardian, Muhammad Ali's Parkinson's disease was diagnosed in 1984. Various reports said that his decision to fight Larry Holmes on October 2, 1980 which ended in a slaughter contributed to him developing the disease.

Since then, the public has tracked the boxing legend's gradual deteroriation.

Muhammad Ali failed to participate in the latest documentary, which only used audio journals as well as interviews with relatives.

"The film, directed by Britain's Clare Lewins, traces the story of Cassius Clay from his birth in Louisville, Kentucky, to gold at the 1960 Rome Olympics, beating Sonny Liston for the heavyweight championship, changing his religion and his name and going into exile after refusing the draft for Vietnam," Guardian said.