Who was laughing inside the radleys house?

In "To Kill a Mockingbird" by Harper Lee, it is initially believed that Boo Radley was the one laughing inside the Radley house. However, it is later revealed that the laughter was from Scout’s brother, Jem Finch, and their friend Dill. Boo Radley was a reclusive neighbor who left gifts for the children and ultimately saved them from an attacker.