The correct answer to this open question is the following.
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Sociologically speaking, Ahmed's family is experiencing Ethnogenesis.
In sociological terms, Ethnogenesis means that an ethnic group is forming out of an original one. The members of the group are increasingly identifying with the new culture and are adding more elements of this new culture into their daily lives.
In this case, that is why Ahmed's aunt, who still lives in Yemen, worries that this Americanized family is no longer Yemeni. Ahmed's teenage daughter feels like her family is not American.
Immigrants are prone to adapting and adopting the American culture due to mass media, social media, and the daily interaction with members of the American community.