My parents (or his parents, my Great Uncle Tim and Aunt Trudy, Superman and Lois Lane) are paying for (all of, part of, this specific thing for) the wedding. How do I word that?
The short answer is that you don’t. There’s a very common misconception that the person or persons listed at the top of a wedding invitation are bankrolling the event. This is not – absolutely not – true. There should be no indication at all on a wedding invitation as to who is contributing financially.