Weddings throughout history have been budget breakers. In Bible times, the bride's parents would have to feed all the guests for several days. Jesus' 1st miracle of turning water into wine was at one of those bashes where the wine had run out.
That said, you need to do some paper work. Figure out exactly how much you can cough up and hand it to them. The rest is their's to deal with. If they can't trim it to the money on hand, they need some lessons in budgeting.
