Cruzenbye, I hope you won't take the following comments offensively. They are meant solely for the safety and welfare of you and your family! You admit that you are a newbie, yet you believe that you know more about Grand Canyon conditions, on the basis of a few dayhikes, than a highly experienced desert hiker who lives in Arizona and is far more familiar with the Grand Canyon than you are. If I were going to hike the Grand Canyon, Pika is the first person on this board whom I would contact for advice and information. I strongly recommend that you heed his advice. In my opinion (for what it's worth), you owe him an apology.
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey