She says home is cold and silent after husband, 2 sons slain in S.F.Danielle Bologna can't go back home. Just a week ago, her two-story house on a quiet street in San Francisco's Excelsior district was a bustling place, crammed with sports gear and trophies and team portraits, where she and her husband of 21 years were raising their four children.But in just seconds on Sunday, her family was torn apart: Her husband, Tony, 48, and the couple's sons Michael, 20, and Matthew, 16, were shot and killed as they drove home from a family barbecue in Fairfield.What is left...