Some of the Westfield Watcher’s letters referred to the family’s young children, calling them “young blood,” and wondering if they were too afraid to play in the house’s basement. The letters were so frightening for the family that they never even moved into the house.
As a result, the Westfield home was rented out and eventually sold. And, despite how creepy The Watcher seems on Netflix, for the real Broaddus family, nothing happened beyond the letters.
Source: https://www.distractify.com/p/westfield-watcher-letters