Is mom and dad a compound subject in a sentence?

Yes, "mom and dad" is a compound subject in a sentence. A compound subject consists of two or more subjects joined by a conjunction, typically "and" or "or." In this case, "mom" and "dad" are linked by "and," indicating that both are performing the action of the verb together. For example, in the sentence "Mom and dad are going to the store," they collectively act as the subject.