Ryan Reynolds is opening up about the "complicated relationship" he had with his father before and after James Reynolds was diagnosed with Parkinson's disease.

Their relationship was made more difficult by the diagnosis, the actor said.

"Maybe people are reluctant to talk about this, but sometimes, when you see a parent faltering, it can almost make you angry," Ryan Reynolds told USA Today in an interview published Aug. 14.

Parkinson's is a progressive neurodegenerative disorder that is incurable.

While the severity of symptoms varies among individuals, James Reynolds, who died in 2015, struggled with challenges beyond motor issues, the actor said in a video posted to Instagram Wednesday.

"You sort of know what to expect from Parkinson's physically. But no one warned us about the hallucinations and delusions," Ryan Reynolds said. "He began thinking strange things about the family and our motives, and there was just no way to talk him out of some of these things.

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Through a new campaign called More To Parkinson's, the "Deadpool & Wolverine" star aims to raise awareness about these "under-recognized" aspects of the disease, while reflecting more on his relationship with his father.

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