I have to add the Illusion Mini-Mag. I've used mine for about 20 years, hunting just about every day of the season. It's a very small double reed call that has great sound to it. The reeds are very close to the mouthpiece and so I believe it blows the spit right out of it. It really does not take a lot of air but can handle a lot at the same time. I've blown in competition and tend to throw a lot of air into a call, but the Mini-Mag never locks up on me.
Even more important than the call is knowing when to blow it and how. Reading the ducks is vitally important. A good "Meat Caller" tends to master reading the ducks even more so than producing superior calling.
You sound like a good Dad. Spend as much time with your son in the marsh as you can! I did the same and now I have a 29 year old son who is an exceptional caller and a great hunting partner.
Moosetrot