Per the LA TIMES obit, Channing and her husband (Charles Lowe) were estranged at the time of his death in 1999. That she walked out on him four days after his stroke was a claim Lowe made during the course of heated divorce litigation.
And for what it's worth, Channing went to stay with her son (from a previous marriage) when she separated from Lowe. But that was 10 years ago. I have no idea what their relationship is now.
http://articles.latimes.com/1999/sep/05/local/me-7137 I'll only add that during a brief period when I worked on a play with them in the 1970s, Loew generally talked to Channing as if she were Lorelei Lee (but without the street smarts). I'd have left him, too, and I wouldn't have waited 25 years.
No doubt what I observed was only part of the story.