Officer Kaushambi Arun Kumar Shukla, of Mahewa Ghat, told reporters that the monkeys, believed to be from the nearby Mahewa forest, surged onto the terrace at 10:30 a.m., startling the family.
She tried to lift her son to the balcony for safety, but the railing collapsed, forcing her to scramble toward the courtyard.
Ramesh Patel, a farmer, said he saw the monkeys for the first time at dusk, "they were just chewing leaves," but the next morning they attacked.
Shaurya was taken to Adhauli Gram Hospital, where doctors attempted surgical stabilization of his broken ribs; he succumbed at 2 p.m.
The police are filing a complaint under the Wildlife (Protection) Act, and forest officials are deploying camera traps to locate the offending troop.
The Jaiswal family, who live on a 10‑acre plot, are coping with grief while the village mourns the loss of a "little angel".