Wholeheartedly agree with that. It is very hard to see a judge being sympathetic to the "they're not college material" argument, when you really didn't try to force the issue with them. In your defense, it sounds as though you did to some extent. Twins reinforce each other, and can really put up a wall when they are so inclined. It sounds as though they may have been quite socially active, had lots of extra-curricular activities, really appeared to be successful, when they really weren't doing so well.
But I would also think that if you describe the effort you have made to help them think about college, get them to consider going to a college near you to stay with you, and that you are making such efforts, and also that they refuse to admit you to the decision process or discuss realistic options with you, it may bear some weight. I also ask the question, what college are they considering, and I repeat my question, what are they thinking of studying, what realistic plans are being made? What you don't want is to put the judge in mind to tell you just "cough up the cash, don't ask questions."