DEAR ABBY: My elderly father died recently. Although he had a variety of ailments, including heart disease, his death was unexpected. He spent many years of his life trying to save my drug-addicted, criminal sister from herself. Despite occasional periods of sobriety, she has invariably returned to her evil ways. Three days before Dad passed, he was again trying to bail her out of a situation involving people she knew who stole her car. While Dad was driving her, she lost her temper (again) and struck him multiple times as my mother (on the phone) begged her to stop. Dad died a few days later,…