To determine if "often busy" is an appositive, we can look at the definition of an appositive. An appositive is a noun or pronoun phrase that provides more information about another noun or pronoun in the sentence. In this case, "often busy" is an adjective phrase that describes the parents. Since "often busy" is not a noun or pronoun phrase, it cannot be considered an appositive. Instead, it is an adjective phrase that describes the parents.