Who wrote this text? I don't know which piece of literature it is that you're referring to.
Answer:
Eu começaria sendo simpático e respeitoso e diria "Oi, mãe e pai. Eu trabalhei muito e acho que mereço um carro novo". Ou você pode comprar seu próprio carro.
I would start off by being nice and respectful and say" Hi mom and dad. I have worked really hard and i think i deserve a new car". Or you can buy your own car.
~DjMia~