They should come out with Father of the Bride: Part III
I see from several topics below that it possibly was rumored for third Father of the Bride movie to be made. I was thinking that a couple days ago that it could and should happen. Megan Banks would now be 21 so by the time it would come out she'd theoretically be 22-25. George and Nina could be ready to retire but with Megan getting married pushes back their retirement plans due to the outrageous price of weddings in the 21st century.
If Steve Martin and Diane Keaton aren't on board with a sequel there's always the possibility of Mother of the Groom where Annie's son George Banks-McKenzie gets married.