DEAR ABBY: I think my grandson lives next door to me, but I'm not sure. I can't sleep at night wondering and worrying. About two years ago, my neighbor kept inviting my then-18-year-old son over to help her do odd jobs while her husband was at work. He seemed happy to help out, and she always gave him some money for the jobs. A few months later, she and her husband announced they were expecting. I work with this man's ex-wife, and she confided to me once that she never had children because he couldn't give her any. To...