Lili witnesses a traffic accident and is suddenly overcome by the fear of death. There are numerous references to other books in the series - it's a kind of Comedie Humaine
for five year olds.
The bit I liked best was when Lili begs her parents to promise her not to die before she's grown up. "Scout's honour!" says Dad. But, as they go to bed, you see them discussing it further.
happen to the kids if we died?" asks Mom.
"We've got a lot of relatives," says Dad.
"But your brother* is always mad at everyone... and mine has a drinking problem* ..." says Mom thoughtfully.
At the bottom of the page, there's a typical footnote:
* You can meet Paul's brother in Lili Celebrates Christmas With Her Family
and Barbara's in Emilie Doesn't Like It When Her Mother Drinks Too Much