DEAR ANNIE: Should we just let this go? My wife and I were invited to my only sibling’s son’s wedding in August. We didn’t attend. For background: My only sister and I have lived our entire lives within minutes of each other. Three years ago, I retired and moved across the state, 240 miles away from her and her family. We were always close during those times, enjoying family events and celebrations. My nephew’s wedding ceremony was on a Sunday evening, with a pre-celebration slated for Saturday evening. Both were at an outdoor venue (a park). To attend the weekend meant that we would’ve either…