The answer explains the use of 'ser' or 'estar' with adjectives in Spanish.
Mi familia es pequeña.
In this sentence, we use the verb ser because the adjective 'pequeño' describes an inherent characteristic of the subject 'mi familia'. It is an individual-level predicate that matches with the use of the verb ser in Spanish.
It's important to remember that with stage-level predicates, we use the verb estar. These adjectives describe states or conditions that are not inherent to the subject.
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