Asking whether a BMW i3 I01 s (120 Ah) Edition RoadStyle is a good family car, 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 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, the darkened windows in the font provide reduced sunlight on the rear seats. The trunk is significantly larger, one uses the folding rear seat.
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.