GenCon can be very overwhelming for anyone. Jerry and I take little breaks during the day while we are at conventions just to have a little time to mellow out. These breaks are extra important for little ones. If you have a hotel close by it might be a good idea to take the kids back to the hotel for a little quiet time away from the crowded hall. If your hotel is further out you could just find a quiet place in the convention center to sit and relax for a bit. The upstairs of the convention center is usually a lot less crowded and a lot quieter.