Asking whether a BMW i3 I01 s (120 Ah) Edition RoadStyle is a useful car for families, is not easy to answer from a technical point of view. The range of families requirements is wide, so this representation only considers the common aspects.
The BMW i3 has only 4 seats and is therefore ruled out as a family car from the outset. The trunk is also very tight with a volume of 1100 liters is very tight. 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 wagon.
Rating: The BMW i3 is due to the small number of seats (4), small trunk volume (1100 liters) regardless of other features, it is not suitable for families.