The woman who did not want to be identified told 10News, "There were a lot of people killed. It was my son, my father and three more."Her son, 13-year-old Ulysses Castrejon was killed execution-style last month along with his grandfather."They took the only thing that I love," said the woman.Martha Lizeth Osegueda Rodríguez, Erick Arzáte García and Marco Antonio López Carmona were arrested on Friday in connection with the massacre.Osegueda is believed to have been a drug dealer out for revenge."I don't know why this happened to us because we were a family a happy family," said the woman.In January, the family went to Tijuana to celebrate Ulysses' 7-year-old cousin's birthday. She said they did not know many people at the party or even the homeowner."I was taking pictures [of] my son because he was laughing and playing with the cake," she said.The laughter turned to terror when she said three men wearing black masks with big guns burst into the home.The women and children were ordered into one room and Ulysses went with the men."And then I heard the shots and I [went] outside and I saw all these people killed and there was my father and my son," she said.Although three people have been arrested, the woman believes two others may have played a role that night.