Flexibility is one of the keys to good parenting, and having a flexible interior comes in handy in the family car so it can accommodate many different passenger and cargo situations. For the youngest kids, look for a second-row center seat that slides forward to bring baby closer to the parents upfront. For slightly older tykes, built-in booster seats are useful to give kids the extra elevation to properly position the seat belt, while helping them feel more like big kids. For "tweens" and teens, captain's chairs in the second row come in handy to keep quarreling siblings apart, giving them some much needed elbow room. Finally, if you need to transport additional passengers, such as your kids' friends, upon occasion, look for additional seating that stows or folds away when not in use, increasing the cargo capacity.