My brother has a scooter and he always likes to take me on rides, but I find it scary. 
What type of license does your brother need for his scooter?  It can vary worldwide.
He uses a Class E or Motorcycle only  driver's license.
Vespa
Vespa () is an Italian brand of scooter manufactured by Piaggio. The name means wasp in Italian. The Vespa has evolved from a single model motor scooter manufactured in 1946 by Piaggio & Co. S.p.A. of Pontedera, Italy to a full line of scooters and one of seven companies today owned by Piaggio.
From their inception, Vespa scooters have been known for their painted, pressed steel unibody which combines, in a unified structural unit, a complete cowling for the engine (enclosing the engine mechanism and
got type approval, the driver would need a motorcycle driving license to ride. As a side note, Hong Kong doesn't have a moped vehicle class (and therefore no moped driving license), and mopeds are considered motorcycles too.
Electric bicycles are not allowed in any public area, meaning an area where there is full or partial public access. Any kind of pedal assist, electric bike, scooter, moped or vehicle which has any form of propulsion, whether in full or as assist, other than human power