Final answer:
The verb 'viajar' should be conjugated in the third person plural form to match the subject 'mis padres', which is plural.
Step-by-step explanation:
In the given sentence, the verb 'viajar' should be conjugated in the third person plural form to match the subject 'mis padres', which is plural. The correct form of the verb is 'viajan'.
Learn more about Verb conjugation in Spanish