I'm so sorry for your loss.

About 10 years ago I lost my grandmother. While visiting for the funeral, I broke state law by driving her car -- as did my aunt. It turns out that in that state, only the spouse can legally drive the car until it's retitled.

Who knows about your state. I suggest asking the funeral home people when you pick up the death certificates. Then verify what they tell you before you go any further.

You want to do whatever is legal...but remember that the dealership and Kia don't want some "consumer affairs" reporter broadcasting on TV how Kia is bullying some poor widow.