PHILADELPHIA (AP) — Authorities say a Philadelphia man fatally shot and killed his sister inside a city home. The siblings apparently started arguing Thursday while they were at a car dealership. The dispute then continued when they reached the home, and authorities say the man fired the fatal shots shortly before 8:30 p.m. The sister was shot twice in the chest and twice in the stomach. She was taken to a hospital but was pronounced dead there a short time later.