Where is the direct object in the sentence? Jessica's family will take a trip soon. Where is the direct object in that?
The direct object in this sentence is "a trip." In order to find a direct object, we must always look at the verb or verb phrase and see what the action of the verb is acting upon. In this case, the verb is "will take." What is going to be taken? It is a trip that is going to be taken.
Let's look at a few more examples.
In this sentence, the direct object is "home."
We are going home now.
The verb phrase is "are going." What is this verb acting upon? It is acting upon "home." Another way of explaining this is to say that "home" takes the action of the verb.
In this sentence, the direct object is "the book."
He took the book back to the library.
The verb is "took." What is taking the action of this verb? It is the book that is taking the action, the book that is being acted upon.