My kid brother wanted to play cars, so I'm going to give him the keys to my stepdad's Corvette.
This can't be safe. Why would you give a child the keys to a real car?
I don't think he will do anything. Regardless of the danger, my stepdad is so careless about his cars.
Children are not allowed to drive cars because it is not entirely safe to let them drive. You should just pretend using your imagination rather than actual items.
Why don't you think my little brother can be responsible enough? He's not a baby.
You shouldn't encourage a child who is under the legal driving age to go joyriding. They could get hurt or even hurt someone else. You should be encouraging your brother to follow the rules not break them.