Eric Sweeney will serve a minimum of 54 years in prison for the 2022 murder of his sister-in-law, Kassandra Sweeney, and her two children, Benjamin and Mason, both under the age of 4.

Sweeney was sentenced Friday in a Concord courtroom filled with friends and family of the victims. Kassandra and Sean Sweeney, Eric’s half-brother, had guardianship of Eric, who was 16 years old at the time of the killings.

Prosecutors requested a sentence of more than 100 years in prison for Eric, while his lawyers pointed to his troubled childhood as a mitigating factor. They proposed a sentence of 40 years.

“Two things are very clear in this case,” said Judge John Kissinger, after hearing hours of testimony from friends and loved ones.

“First, Mr. Sweeney — Eric Sweeney, the defendant here — had a horr

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