When you've had a parent struggle at the end of life with Alzheimer's or dementia, you don't take your own memory glitches lightly. We all have them, but after my father died, I found myself looking more carefully at my own brushes with memory loss. So imagine my dismay last week when I accidentally left my sister at the airport to fend for herself and find her way to our house all because I had written on my calendar that she was coming in on Monday instead of Sunday. I was totally thrown out of whack by this major scheduling snafu. We laughed, I sighed deeply, and then moved on. Monday morning I dragged her to my semi-annual dentist appointment. I know what you're thinking: your sister came 3,000 miles to see you and you dragged her to the dentist???! Well, in all fairness, she only made these reservations on July 1st and rearranging those semi-annual visits is as easy as booking dinner with the queen. She assured me that she was happy just spen...