Dear Abby: My drama-filled sisters could lose out on my generous help if they don’t shape up

DEAR ABBY: I am a 67-year-old man who has two sisters. Recently, I was at my younger sister “Mitzi’s” house, installing some blinds. While there, I received a phone call from my girlfriend. (We have been together nine months, after my wife passed last year.) My girlfriend and I were discussing…