I take my 4 year old daughter to school with my Gazelle Cabby,
baby brother safe and cosy in his car seat.

These bikes are absolutely genius! Relatively light weight, 7 gears, good brakes, can carry quite the load.
no pesky 3-wheeler and you can fold the seating so it doesn't take up too much space.

Here's some pics, none of them are mine, just plucked them from the web: