This actually just reminded me, last time I was out, it was me, a ski buddy, and my 10 year old boy on my boat. I was out skiing, and I had just dropped and my father in law called. My 10 year old answered. He starts trying to ask me questions out in the water in stuff. I told him to tell Grandpa I would call him back in a bit. After he hung up, I let him know very clearly that while there's a skier in the water, phones don't get answered. He was happy to comply, of course. He just didn't know. He's 10 after all.