Not all Toyota Siennas have AWD, but all six trims on the newest model year offer AWD as an available option.
Depending on the trim you choose, adding AWD will cost you either $760 or $2,000, but critics maintain that the added traction and handling are well worth the added expense.
One thing you may find interesting about the Sienna is that Toyota recently changed all models to hybrid—a great way to save at the pump with a growing family. With this powertrain, you get up to 36 mpg on the highway and 36 mpg in the city.