Asking whether a Audi A3 8Y Sportback 40 TFSI e S line S tronic is a useful automobile for families, is not easy to answer from a technical point of view. families pay attention to a wide range of things when buying a new cars, so this consideration only considers the common aspects.
The Audi A3 brings 5 seats with it which is basically good and sufficient for many families, but the car fluffs when it comes to the trunk - 1100 liters of volume might not be sufficient for most families. There are no Isofix brackets installed. These could be used to secure child seats easily and safely, via airbag deactivation, babies and small children could be carried along in corresponding seats against the direction of travel on the front passenger seat - however, this function is unfortunately not available on this vehicle. The trunk is significantly larger, one uses the folding rear seat.