I've got a Tern GSD that I use for kids that age and it works amazingly. Electricity Bikes should be able to let you do a test ride of that and some other brands and models.
If you're on Facebook, there's a group for "DC Family Biking" that talks about stuff like this all the time.
Clock_Roach t1_ivkcpwb wrote
Reply to Cargo bike recommendations? by ceruleanna
I've got a Tern GSD that I use for kids that age and it works amazingly. Electricity Bikes should be able to let you do a test ride of that and some other brands and models.
If you're on Facebook, there's a group for "DC Family Biking" that talks about stuff like this all the time.