Final answer:
It is difficult to determine which lullabies do not feature a character being killed in a car accident without more information.
Step-by-step explanation:
The question seems to be asking about the lullabies the student's mother sings, specifically, which ones do not feature a character being killed in a car accident. Unfortunately, none of the provided references explicitly mention any lullabies being sung by the mother, nor do they mention characters being killed in car accidents.
Therefore, without more information, it is difficult to determine which lullabies do not have this theme.