Lots of different types of food work, so here's the best tip I can give you. Fill the bait right before first light everyday you bait. The bears will get use to the food showing up at the same time and the bears for the most part will come in during shooting light due to them wanting to get the food before another bear does. When you go to hunt have someone go with you, your son and you get in the stand while they bait, then when they leave your all setup and generally the bears got no clue your there.
God bless and Good luck!