Asking whether a Audi A3 8Y Sportback 30 TDI S line S tronic is a useful car for families, is not easy to answer from a technical point of view. families have a wide range of requirements, so this consideration only considers the common aspects.
The Audi A3 has 5 seats, which is enough for many families, and also brings a decent trunk with 1200 liters of volume, in which there is still room for luggage even with a stroller loaded. Good conditions for a family car. There are no Isofix brackets installed. These could be used to secure child seats easily and safely.