William's "girls"

Mike's two youngest daughter's Katie and Kathy are always called "my girls" by William. When he was younger we would say "We are getting the girls this weekend" so when he was old enough to talk he would call them his "girls". At 5 he is just know calling them by there names! He still calls them his "girls" but when talking to them he will now at least call by there first name. So when I say my girls you know it's Katie and Kathy!