One thing worth remembering is that snappers are surprisingly transitory and may move on without too much prompting. Of course, they may also make themselves right t'home. They are sloppy eaters and you'll know if they are taking your fish; you'll find heads or tails floating in the water. Ric's right about catching them with some stinky meat--chicken neck works good--use a biga$$ hook on heavy wire leader with some heavy fishing line or cord tied around a tree or some such. All in all, however, they do form a part of the system and you might monitor Gramps for evidence of harm before you get aggressive with him.
