If multiple family members reside under the same Consular Jurisdiction, they will all be able to share the same document portfolio. Each adult applicant is required to book a separate appointment with the Italian Consulate.
If all of you reside in different states that are under different Consular Jurisdictions, then multiple document portfolios all in original will be required to present to each Consulate. Remember: Italian Consulates do not share any documentation and they do NOT return any of your documents.