Literacy, Discourse, and Linguistics

I can remember a long time ago when my younger sister was learning the many words and phrases and rules associated with the english language, and I specifically remember that she had a tough time with the past tense.  I was only three years older than she was, but would notice it every now and then and would immediately want to correct it because it was not the right discourse to me.  I still had a battle between the primary discourse of the community and my secondary discourse, but was closer to making my primary discourse the accepted one than my younger sister, so my parents were usually the ones that brought the hammer down.  They would do constant tests everywhere we would go, in the car out to dinner, at grandma and grandpas... just testing her past tense skills until she showed that she was starting to leave the previously dominant secondary discourse behind.  Of course this "help" was not at first welcomed by my sister, but as time went on and she improved she became more tolerant of the practice. This situation from my child hood is what I believe Gee is describing when he talks about dominant discourses and how the users always want to correct anyone who doesn't speak the same way.