Final answer:
The sentence 'Mi familia fuera la más grande' is incorrect. The correct form is 'Mi familia era la más grande'. The imperfect form of the verb 'ser' should be used when describing ongoing or repeated actions in the past.
Step-by-step explanation:
The sentence Mi familia fuera la más grande is incorrect.
The correct imperfect form of the verb in the sentence should be fuera, not fuera. The correct sentence should be Mi familia era la más grande.
The imperfect form of the verb ser (to be) is used to describe ongoing or repeated actions in the past. In this case, we are describing the family being the biggest in the past.
Learn more about Verb conjugation in Spanish