If the car is been used by more then 3~4 person everyday in your family. I think a car is a necessity.
If just to sent your wife to work & put yourself to work, the car sit in the parking lot for the rest of the working hours, it becomes a luxury item. Provided $ is not a problem.
Why not opt for a Bike? Like me

Cheaper then cars & get to where you want. No parking problems, no traffic jam, Summon also cheaper. Only have to put up with rain but look how big is Singapore. If I really need to make that trip in rain, I dial a cab. For family days, public transport & cab makes sense for me. Sunshine is pretty ok for me here in Singapore. I have tried riding on the road at more then 50 degrees. I find Singapore heat condition is ok. Even wearing a tie & coat riding a bike also looks cool

Basically car have 5 seats, fill at least half or more makes sense to owning a car. Lesser filled means you are paying for nothing.
Some informations for your considerations:
I ride a 125cc Bike. Paid the bike Cash, I don't have loans. Petrol cost me average SG$60 per month. Bike insurance is $169 third party per year. Road tax is $80 per year. Parking is free at work & shopping place. Parking at HDB, I don't pay at all, I cover my bike everyday. ERP cost me average $10 for 3 months.