Definitely go before school lets out for the summer, then. I saw the show last summer, Friday evening (July). Got a student ticket in the last row of the Orchestra. Seat was fine - the distractions, not.
Lots of small children there...I love introducing children to theater (I was introduced myself at 8 ), but I do think that 2 years old isn't old enough for them to remember and enjoy it. And I saw plenty of 2 and 3 year-olds, sitting on cushions that still didn't elevate them high enough to really get a good view of the stage. This led to lots of fidgeting kids and therefore lots of adults were getting up and down to tend them. Being in the back of the Orchestra, I was distracted when many parents got up every five minutes.
I've been to all of the Disney shows, and interestingly enough this was the only one where I found the audience distracting. In Feb, during school vacation week, I was in NYC and saw a Sunday matinee of Mary Poppins. Many children in attendance and all were so well-behaved - I was impressed! Though the difference may have been the age-range. There were really no 2-year-olds at Poppins.
I didn't care for the show (and I love the film and its score!), but it hard for me to make a judgment call on what you might enjoy. I'd book a weeknight performance for you and your grandparents (and there are discounts available right now especially during the week as well).
Updated On: 4/22/09 at 10:25 AM