1.Where are (the aronsons) going for vacation
is the underlined a subject direct indirect object or predicate nominative
It's the subject.
In the given sentence, "(the aronsons)" is underlined. To determine its grammatical function, let's break down the sentence:
"Where are (the aronsons) going for vacation?"
In this sentence, "the aronsons" is a noun phrase functioning as the subject of the sentence. The subject is the person or thing that performs the action or about whom/which something is stated.
Therefore, "(the aronsons)" is the subject of the sentence.