Consider the following sentences:
Please consider the person who's shirt is red.
Please consider the car what's bumper is blue.
Please consider the car who's bumper is blue.
Number 3 sounds wrong to me and number 1 sounds right. A car cannot be a "who" unless its a work of fiction. The question here is whether or not number 2 is correct form.
Is number 2 correct form? Why or why not? If not, what would be the correct form to refer to a specific inanimate object what's component is blue or based on some other criteria. What rule specifies that it is correct or not correct.