Although Sarah's death was tragic, I was more affected by watching Naomi grieve. Hearing the poor woman break the news of their daughter's death to Joshua, using the metaphor of a bird that flew away, and then listening to her in the mausoleum ("I begged you to bury them in the earth. Their whole lives were stone; now it will be stone for eternity.") is so wrenching.

Another sad scene that stands out for me is when Magda tells Quentin that his son, whom he never even knew existed, has just died. A brash and volatile cad up to this point, Quentin looks stunned and quietly murmurs, "My son is dead...my son is dead." It's really the first time he shows an emotion.
The 1995 sequence and the interractions among Mrs. Johnson, Carolyn, and Quentin are also all very sad.
ProfStokes