Catfish in Black Bean Sauce (1999)

Dwayne and his older sister Mai are adults: Mai is married to Vinh, Dwayne is about to propose to Nina. Twenty-two years ago, when Mai was 10, she and Dwayne were refugees in Vietnam, adopted by Harold and Dolores Williams, African-Americans from Los Angeles. Now, they remain close, especially Dwayne and his parents. Mai drops a bomb: she's located their birth mother, Thahn, and she's flying her to L.A. Dolores takes the news hard: she sees herself being replaced. Harold is more sanguine, and Dwayne pretends to be indifferent. When Thahn arrives, tensions reach the breaking point between Mai and Dolores, between Nina and Dwayne, and even between Dolores and Harold. Can they all get along?