"I'd always assumed it was the booze and stuff," Osbourne told the World Entertainment News Network. "Now I've found it all stems from the family."
Once doctors diagnosed Parkin Syndrome, Osbourne said his sister told him his mother, aunt and grandmother suffered from the same problem.
"I'm like, 'Thanks for (expletive) telling me'. Me walking around thinking I've got some drug paralysis," Osbourne said.
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