My one friend takes all his kids from the time they were 5 years old. Every year I take a friend and his son along the trapline with me. The kid has more fun then both of us and his Dad doesn't even trap. The younger you start the kids, the better they learn to accept the cycles of life in the wilds, before the teachers and Disney can fill their heads with Thumper and cruelty. It will be better for the children to learn this lesson now before a survival situation where they might refuse to eat the meat or wear the fur, their health and maybe their survival depends on it.
Groundhogs are easy to trap.
Stabilize the trap and take the safety off. Don't forget to wire it off. If there is nothing to wire off to, then use a stake, a sharpen stick pounded in to the ground. Show the farmer the dead ones and skin and sell the hides to fishermen who use the fur for tying flies. I like making these next to beaver dams because the bobcat likes to hunt around the dams.