I would say this is a pedicab, not a "family ebike". The concept of human-powered family sedan somehow didn't take off. There is sure market for pedicabs, though I don't think this one will be viable in my city. Bamboo is the material of choice where there is plenty of it, and also cheap labor, because in developed countries structures from fiberglass and aluminum are more practical. Maybe India or South-East Asia. Without doors it will be limited to warmer climates or summer-only use.
The concept isn't new. Rickshaws without motor have been around for centuries, and India is full of pedicabs and cargo trikes with stinky moped motor.
Check homepage of this EBR site -> electric trikes reviews. Quite a few trikes, mostly singles, because this is what individual consumers demand. There must be more electric pedicab models than we are aware of. In San Diego CA there is a thriving pedicab business near Mexican border, cheaper than a taxi. Don't remember what e-bike brand they use, if this is even a brand.