I am not disagreeing, but this is a classic example of where I think orders are not specific enough. If TX specifies that weekends begin on Friday, then it's probably covered, but a lot of states don't have a rule like that - so you get questions like this one "when does the weekend start?"
If you're going to use 'first, third, etc' weekend in an order, it really ought to say how that's defined.
In my opinion.