Final answer:
The correct verb form to complete the sentence is 'admiran'.
Step-by-step explanation:
The correct verb form to complete the sentence is admiran. This is because 'Mis padres' is the subject, which is plural. Therefore, the verb form should also be plural to agree with the subject. The verb 'admiran' is conjugated in the third person plural form in Spanish.
Learn more about Spanish verb conjugation