We've got tickets to see this at Shea's too, but I'm not bringing the kids, 5, 5, and 2. The tickets I could afford were in the balcony, and I thought it might be too far away to hold their attention. At the Phantom at Sheas, I brought my binoculars! That worked out for me, but I don't think it'd work for them.
One thing you might try at Sheas is to get "rush" seats. Sometimes if a show is not sold out, they might offer rush seats after the run starts. If you show up at the box office 1 hour before the show, you might be able to purchase balcony seats at half off. So I think balcony seats are like $22 regular, that would be quite a discount. You could also call the box office to see if rush seats will be available, instead of just showing up. I tried to do rush seats for "Moving Out" but they didn't offer them then.