My Nan (grandmother) ALWAYS does this when I call. I say "Hi Nan" and she says "Hi Sweetheart", I go on to say whatever I'm calling about and then she says "Who is this anyway?". hahaha as soon as I say "Hi Nan" she knows it's one of her grandkids so "Hi Sweetheart" is an appropriate response but she hardly ever reconizes who it is by my voice I Love my Nan, I'm going to visit her this afternoon