CONCORD — A 19-year-old from Northfield was sentenced to 60 years in prison on Friday in Merrimack Superior Court, for the 2022 slaying of his sister-in-law and two nephews, one of whom was 18 days shy of his second birthday, the other wearing a dinosaur costume at the time of their deaths.

In a case that rattled the Lakes Region, Eric Sweeney, who was 16 at the time of the four-minute altercation on Aug. 3, 2022, was charged three times with reckless second-degree murder, and once with falsifying evidence. In 2022, Sweeney stole a gun from a safe located under his brother’s bed, and subsequently used it to shoot his family members at close range, including Kassandra Sweeney, 25, Mason, 4, and Ben, 1.

The Hon. Judge John C. Kissinger Jr. opted for a sentence to give Sweeney a “narrow” op

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