I don't believe the "North Texas Families" are a result of parents steering their kids one way or another. The school just becomes such a huge part of your life the desire is there on its own. I'm in my mid-20's and have been going to games since I can remember. In the last 2 and a half decades we've missed maybe 4 or 5 home games. When it is what you are raised with it's in your blood. My parents never told me to go to NT, in fact I was encouraged to look elsewhere. I applied to and was accepted to other schools, all of which offered better scholarship options than NT, but you can't ignore where your heart is.
I'm only a second generation NT grad, but I know some who are 3 and 4 generations. It is exciting to hear stories growing up and then get to make your own memories while being distinctly connected to someplace your parents were in the past. I even had the same history professor my dad had. With my wife being a NT grad as well I can't see us raising our (currently non-existent) children any other way. The importance of "the school" has been debated on here many times. To me at least, NT is more than just where my tuition went, it has shaped my life in a way few things have. I look forward to sharing that with my kids (of which hopefully there is an elite QB or soccer star) .