1 The children's costumes were scary.

Statement Analysis:

The statement 'The children's costumes were scary' is presented as a fact. However, the provided text does not contain information about the children's costumes. The narrative focuses on the events of trick-or-treating, the encounter at Mrs Shade's house, and the mother's reaction. There is no description of what the children were wearing.

Conclusion: Based on the given text, it is not possible to confirm or deny whether the children's costumes were scary.