Names

This last week, Maysie has gotten into this stage where she is calling everyone by their 1st names... Like instead of calling Rob, Dad, she calls him Rob. I am now called Kelli - unless she is hurt of course then she remembers that my name to her is Mama :). Even when my mom was down here last weekend for Camden's Baby Blessing she called my mom Noni instead of Grandma half the time. The funny thing is, she calls Camden, Brother instead of his name. Where does she come up with this stuff? And how long does it last?