ISD boundaries and city limits are not the same....ISDs were created in the 1920s, based on local option elections by property owners....In the case of Grapevine and Southlake, farmers might have been traditionally a part of one of those ISDs and stayed with them, then as the towns/cities began to grow, their property (not their school district's) was added to the city's incorporated jurisdiction....Don't know the specifics in this particular case, but it's possible that the family's mailing address was in Southlake, but the school district's territory overlapped that boundary....That's why parts of Fort Worth municipality territory is in Eagle Mountain-Saginaw, or Birdville, or H-E-B, or Keller or Crowley, or Everman, orNorthwest ISDs....Also, north Arlington's Veridian development is in H-E-B and parts of Hurst in Birdville ISD....Not defending any one in this particular case, but Tarrant County Tax appraisal notices carry identification of ISDs, so no property owner can believe that a plea of ignorance would stave off trouble....Grapevine ISD upper administration and campus administration alike should have been more attentive....And, yeah, someone snitched for sure for whatever reason....