Helpful advice would include legal ways to get the dealer he bought the car from to either fix it or take it back and refund his money. What he does from there is a whole different situation. But he has to solve the current issue first, which is that his son has a broken car which may very well be under warranty and is NOT covered by lemon laws.
So unless you have a legally supported way for the OP to get his car exchanged for a Toyota in Missouri, nothing you've said is relevant, helpful, or reasonable.