"Grampsy"

So yesterday afternoon, out of the blue, Sunny changed Gramps' name to "Grampsy". I think it was cute at first, but I'm pretty sure Dan is tired of it now. She has continued to call him that today. She follows him around saying "your name is Grampsy, right?!" "Hey Grampsy, Grampsy, your name is Grampsy, right?!"

Poor man...