Final answer:
The verb 'ir' should be used and conjugated to 'iban' in the imperfect tense for the subject 'Mis padres'.
Step-by-step explanation:
The correct verb to use in this sentence is ir, which means 'to go' in English. To conjugate ir in the imperfect tense to match the subject 'Mis padres', we need to use the appropriate ending. Since 'Mis padres' is a third-person plural subject, the conjugation for ir in the imperfect tense would be iban.
Learn more about Conjugating verbs in Spanish