What is the central idea of this excerpt?

grimm brothers

The Grimms collected stories about real living conditions from people they trusted.

Explanation:

The Grimm brothers obtained their tales from educated people they came to know quite well. These acquaintances, on the other hand, first gathered the stories from people who lacked education. So even though the Grimms did not know all the sources of their collection of tales, they still made use of the literate people they had confidence in.