DEAR READERS: A recent question from “Not So Empty Nest Mom” sought solutions on how to deal with her two adult daughters’ stuff, which was currently filling the family garage after the daughters had left home. I asked readers to offer their own solutions, and this column is devoted to these suggestions. DEAR AMY: I have two sons. Getting them to retrieve their treasures was a challenge. They were simply not interested. My solution … I have been giving them their own “treasures” for Christmas gifts and birthday gifts! Yes, the old impressions for braces, awards from elementary school, and ma…