Ha ha, that's so funny! I bet your grandson will be giving you a run for your money soon. I'm sure your grandson will eventually get the hang of it too, and he might even surprise you with his duck-calling skills in the future. Therefore, I suggest thinking about quality education today and contacting a reputable recruiting agency that will recommend the most qualified Primary Teacher for your grandson. In the meantime, enjoy the moments you have with your grandson and the laughter that comes with his efforts.