Final answer:
Most children in the United States assume their father's last name based on the principles of patrilineal descent.
Explanation:
The child is given the grandmother's last name. In the United States, most children assume their father's last name even if the mother retains her birth name, following the principles of patrilineal descent where the family surname is carried through the father's line. Therefore, the child receiving the grandmother's last name is not generally how last names are determined in the United States.
Learn more about Patrilineal Descent here:
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