Heartbroken dad of four kids killed by mother and grandmother in murder-suicide seeks $400m, alleging years of ignored abuse

The devastated father of four children poisoned to death by their mother and grandmother is seeking $400 million from New York authorities, alleging a horrifying pattern of abuse was allowed to continue for years despite repeated warning signs.Brady Harmon has filed a legal notice signaling his intention to sue the City of Mechanicville, Saratoga County, two school districts and a housing authority, accusing agencies of failing to protect Harper, 13; Hudson, 11; and 10-year-old twins Gavin and Gracelynn Harmon.