Big Sister

Just now, while the kids were playing "work", I overheard Mackinna tell Kaden, "That is not appropriate."  She used it in proper context so I guess she knows what it means...  Now they seem to be fighting.  Kaden is yelling "mo" and Mackinna is speaking to him in her "teacher" voice.  Oh now she is yelling- the teacher voice is gone.  "That is NOT nice, don't hit me!"  It is kind of funny but I  guess I should go break it up.