Mount Willey is a mountain located in Grafton County, New Hampshire. The mountain is named after Samuel Willey, Jr. (1766–1826) and his family, who in 1825 moved into a house in Crawford Notch. The family was killed a year later in August 1826 during a landslide.
The family was killed in the house in Crawford Notch.
The snipper only states they were killed in a landslide. It doesn't state they were in the house. The AI is unsure of this for what reason I do not know.