A Queens school-bus driver fatally shot his wife of 19 years and their two teenage daughters before turning the high-powered rifle on himself. Early Monday morning, police found the bodies of Dionne Coy-Bailey, 42, and her two daughters—Yanique Bailey, 19, and Yolanne Bailey, 14—each shot once in the head. Mark Bailey, their father, was found in a living room chair. The motive remains unclear, though friends and neighbors said the gun itself had been the source of severe disagreements. Coy-Bailey had moved out with the couple’s youngest daughter in December because her husband ignored her requests to get the gun out of the house. They moved back in just before Christmas.