Q: With a son having been attacked by a swarm of yellow jackets the timely question is how to locate their hole and eradicate them.
A: Put a rotten banana and some tuna on a plate on a small table outdoors. Sit nearby in a comfortable chair; bring a book to read. When the yellowjackets discover the bait, watch which way they fly away. Move the plate several feet in that direction a couple of times and start looking for them close to the ground. Morning or late afternoon is best (when the sun is low on the horizon). You can see the flying yellow dots pretty clearly against green foliage or brown pine straw.