DEAR ABBY: My husband and I have an elderly (90-plus) aunt who lives with her son in a town about four hours away. She corresponds by letter with us regularly, and we always write back. However, it has become apparent that she’s not receiving our letters because she doesn’t make any comments on any of the things we write to tell her about. We suspect that her son is withholding her mail because we have written to him in the past to express our displeasure about how he treats his mother’s emotional and safety needs. In the last letter we received ...