The Gathering (1977)
The Gathering is a made-for-tv movie starring Ed Asner and Maureen Stapleton about a man who learns he is dying and tries to gather his dis-jointed family together for one last Christmas. The caveat is that none of his children know he is dying.
Rounding out the cast is Gregory Harrison who plays Adam "Bud" Thorton, Jr., a very outspoken critic of the Vietnam War, who after an arguement with his father, moved to Canada under assumed names.
The movie was nominated for five emmy awards and won two including Outstanding special - comedy or drama.
Here is the final scenes from the film.