What exactly do you need? Every passenger gets to bring a personal item for free. How many carryon and checked bags do you need? I disagree with the above advice to purchase Smart. It's more expensive than just adding a checked bag a la carte. I would purchase Viva Zero fares for everyone in your family and add a checked bag (or multiple bags if needed). Then everyone can bring a personal item with what they need for the flight. That's the most economical way to fly with Viva. You can see the exact prices for Smart and bags on Viva's site and compare to see if Smart is worth it for your itinerary.