Macaulay Culkin's estranged dad Kit Culkin suffered a massive stroke Tuesday ... and he's in very bad shape ... family sources tell TMZ.
EMTs responded to an emergency call from Kit's home in Grants Pass, Oregon just after 1 PM. A family source tells us ... Kit was taken to the hospital where he remains in intensive care.
We're told Kit -- who is 69 -- has lost almost all of his motor functions and the prognosis is not good.
Sources tell us ... family members have been summoned to the hospital.
Macaulay, who famously got into an epic feud with his dad over money, was not available for comment.