OAKLAND — A night of horror one year ago that ended with four people dead at an apartment on Belgrade Road started with a children’s tea party. Around 6:30 p.m. on Nov. 4, 2015, Mike Muzerolle, his girlfriend, Amanda Bragg, and their daughter, 3-year-old Arianna, had sat down to play with the new tea set the couple had given her as an early Christmas present. “We were just having a tremendous time, just talking and playing with her,” recalled a friend, Carla Chaput, who was with the family that night.