An electric car, especially the MG Comet, is a great option for Mumbai, especially considering your wife will only drive it in the city, and with only your child as a passenger. Its biggest advantage is its ultra-compact size, which makes it incredibly manoeuvrable and easy to park in the smallest of spaces. Plus, it has light controls and plenty of pep, and is surprisingly spacious for its tiny size. Do note, however, that the range from the small battery is not great, and it is best to have a charger installed at home. If you can get past its unconventional look, the MG Comet is in many ways the ideal city car.
However, if you want something more conventional, the Tata Tiago EV is available at a slightly higher price. 
