Actually, my grandmother taught me the verses.*She was.
Many people gather at an inn to hear the story of the the "three child criminal saints". Everyone shares their small parts of the amazing story.
One woman would like to share the part of the story she knows, she says that her grandmother taught her what she is sharing and a man questions if the grandmother was someone he knew about. The foreshadowing implies that the woman's grandmother is somehow connected to the woman's story about the children.
When they finish the conversation, everyone yells for the woman to keep going on with her story. So she tells her little part in the extravagant tale.