CONCORD, N.H. (AP) — A young man from New Hampshire who was 16 when he killed his sister-in-law and two young nephews deserves at least 97 years in prison, prosecutors will tell a judge Friday. Originally charged with first-degree murder, Sweeney instead pleaded guilty in August to lesser second-degree murder charges. “Their murders deserve separate, consecutive sentences.”Kassandra Sweeney, a nursing assistant, worked nights so she could care for her boys during the day. He said he went upstairs and found his sister-in-law and nephews on the floor bleeding and then took Kassandra’s cellphone and keys and drove away. Without providing a motive for the killings, his defense lawyers wrote that, “His depression deepened.