3 Men and a Bride
This would be, IMHO, the best way to do it. Have the story so that Mary is engaged and play off the "father of the bride" scenarios with the "three dads" each trying to play his part and helping Mary get through this.
The Big Scene could be Mary Being Led down the aisle by all three men at the same time or led in stages, with each "dad" taking her some of the way.
"Everyone's a critic...except people who still know how to kick back and ENJOY a movie..."