I encourage you to look up the definition of ethnicity. Once the definition is known you will be able to better know which ethnic group the individual belongs in.
Black and Italian
Black
Black and white
according to mixedfolks.com she's part Italian and black.
She is mixed with white and black
Her father is white and her mother is black
Black and swedish
Black and White
Her father is white and her mother is black
Half White / Half Black
barretts oesophagus is most common in white ethnicity. it is much less common in black, Asian ethnicity.
His mother is white and his father is black, he is mixed