Quote from : Sharp Objects Book

Natalie was buried in the family plot, next to a gravestone that already bore her parents' names. I know the wisdom, that no parents should see their child die, that such an event is like nature spun backward. But it's the only way to truly keep your child. Kid grow up, they forge more potent allegiances. They find a spouse or a lover. They will not be buried with you. The Keenes, however, will remain the purest form of family. Underground.