All the onstage seating is roomy, obviously, especially the banquettes and the stools, but if you're on more of a budget, the orchestra and mezz seats next to the little end-tables (the tables with the little lamps on them) are a bit better than the other seats, since you can kinda spread your feet into the end-table space. If you place one parent on each side of an end-table, that might work...
Unfortunately, the old "buy-an-end-of-the-row-seat-and-spread-into-the-aisle" trick doesn't work so well when the actors use the aisles a lot...