Okay- I looked at my settings for the comments, and it is open to anyone to leave one. If you do not have a blog or a user ID then you can select anonymous and just simply sign your name at the bottom. OR you can create a profile where you don't have to keep up with a blog it'll just create a username for you. Every time you comment you do have to do the word verification just to prove you aren't spam, but if that it annoying in the least bit or you are having trouble seeing it (Grandpa or anyone else!) just let me know and I can take it off.
Also- when you comment it not only lets me know who reads it, but I enjoy getting your feed back just as much as you like to hear about what I am doing (: