Early Alzheimer's?

This past Spring I drove by the most beautiful purple irises I had seen in a number of years. They were tall, full and a really deep purple. They definitely brought back memories.

I strongly remember that there were a bunch of extremely beautiful purple irises in front of my grandparents' house on the south shore of Lake Erie. I always wondered about them because no one ever used the front door, they weren't visible from inside the house, and my grandma didn't seem overly concerned about landscaping, though I remember Dad planting a few rose bushes in the back she could see from the window.

Some of my favorite memories revolve around this house, this land and Lake Erie. Growing up we spent a lot of time up there fishing and swimming.

So I told my sister about the irises and how much they brought back memories. She said, "What irises?" Even after describing them, she had no idea what I was talking about.

Since my aunt had lived in that house for a number of years, I decided to ask her about the purple flowers. She said there were no irises at the house.

Now I have got to wonder -- why on Earth do I think there were irises? If they weren't at Grandma's house, where were they? What other things do I think I remember but never happened?