I'm going to refuse to continue transporting my aunt after a car accident
Why are you refusing her transport?
I think it's ridiculous to risk by life for a person who is going to die soon anyway
It's rude to not help out a family member after they have been in an accident like that. Imagine if your family said that about you.
They will understand since they will see me wasting my time.
Caring for a family member is not a waste of time. You would want someone to do the same for you if you were in a similar situation.