Joe Jackson, patriarch of the Jackson family of musical performers, suffered a stroke in Brazil on Sunday and is being treated in a Sao Paulo hospital.
Jackson, who was in Brazil to celebrate his 87th birthday, was diagnosed with a stroke associated with cardiac arrhythmia, the Albert Einstein hospital said in an e-mailed statement early Monday morning.
Joe was estranged from Michael - who became one of the world's most successful and best-known performers - before his 2009 death. He also strayed apart from his wife, Katherine, and many of his other eight children.
A press representative for the hospital said Jackson continued to undergo treatment on Monday.
A representative for Jackson could not immediately be reached.