Answer:
Subject = The Henderson family
Predicate = moved into an apartment on the 14th floor
Step-by-step explanation:
Subject is the word referred to in a sentence. Subject, more simply, is the word that indicates in a sentence who is acting; who is receiving an action; who is in a situation.
In turn, the predicate is a basic sentence member attributing to a subject or independently expressing an activity, state, or property. It is usually a verb in a certain form or an auxiliary verb with a noun or adverbial form.