Our BIG question is, how/when can our son get in-state tuition in Texas if we only just move there the summer after his high school graduation?
Your son will not be considered a Texas resident for tuition purposes until you have resided in Texas for 12 consecutive months. And, even then, if he has already enrolled at a Texas public college or university as a non-resident, he will not automatically be granted in-state status at the end of the first year. He will have to apply for it, and the determination is made on a case-by-case basis by the individual schools. If your intent to remain in Texas is clear (more on that in a minute), then your son’s reclassification is probably just a formality, but you still need to understand that it is not a sure-thing.