I forgot to mention in the Xander update: he surprised Dan and me last week by referring to both of us by our names. I didn't even know he knew who "Dan" and "Jess" are, but apparently he does. This morning he couldn't get my attention and started hollering "Jess! Jess! Help you!"
This shouldn't surprise me; Griffin calls Dan by name on a regular basis and occasionally does the same to me. I think it disturbs some of the more traditional Mr. & Mrs. types that we know (who, now that I think of it, are few and far between these days), but after the initial strangeness of it, neither of us minds. If the owner of the name isn't bothered, no problem.