DEAR ABBY: My wife and I have a 45-year-old nephew who married for the first time two years ago. Before that, he was engaged to a woman I’ll call Anita for two years. We assumed the reason for their breakup was she wanted children, and he did not. Last year, we attended Anita’s wedding, as we are still friendly with her. Our nephew was, and still is, furious with us for going. He claims “only 5% of people attend one’s ex’s wedding.” He says we should have been loyal to him and abstained because Anita was a “vicious, lying, rumormonger.” He ...