Question

either my father or my sister use their credit card - correct the sentence​

Answer 1

either my father or my sister can use the credit card.

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Answer 2

Answer:

Either my father or my sister uses their credit card.

Explanation:

Subject-verb agreement refers to the agreement between the subject and the verb in their numbers. According to this agreement, the number of the subject should be equal to the number of the verb. In the given sentence, the error is in the subject-verb agreement. The subject is singular in number, therefore the verb used should be singular too.