When I try to call one of my kids and use the other ones' name...I have a boy and a girl, they don't like it!
My mum had five of us and used to go through all five names in turn when trying to address any of us. I used to tut and roll my eyes, I'm sure she was smiling inwardly knowing that I would do it too.
My Grandma does this, fortunately I'm only 3rd on the list: mum, aunt, me - being oldest grandchild has some advantages 
My Great Grandma also used to do this, when I was 14th on the list - 4 children, 9 grandchildren, me. Being oldest great grandchild has some advantages, my youngest cousin had to wait ages before she got to him! 