Parents are responsible for the children they transport. If you drive your own child, there's no exception to car safety laws. If you're driving someone else's child as a favor, the booster seat is optional.  A child under three must still be in the full car seat. The booster seat is not required for an older child if you're giving someone else's child a ride without pay. As the driver, it's your responsibility to ensure that you're following the law regarding the safety of the children you're driving and following all Florida laws.