I was going to be the parent who holds all the lines. The no-cell-phones-until-high-school line. The dresses-that-look-your-age-for-the-middle-school-dance line. The only-one-sugary-treat-a-day-and-only-a-small-one-at-that line. And the common-sense-media-tells- me-all-I-need-to-know-about-what-you-should-be-watching-on-television line. These lines are intended…