RIP Ryan O'Neal...always a light comedy guy in films...but a pro. My favorite and he was damn good in it, his best imo, was Barry Lyndon.
I know he has/ had a troubled son named Redmond, which was his character's name in Barry Lyndon. I readhe was in an institution for some time. The kid was absolutely haunted all his life with severe mental problems and drug addictions. A truly sad story.