The Snellas are the Heffleys neighbors from across the street the have children whose names start with an s once when the heffleys went to their house he put the deviled eggs in the plastic plant in the dining room they throw a big half birthday party six months after a new baby is born Frank made it out of all of them when Greg got away with it the Snellas thought the carpet was smelling but it didn’t solve the problem they then thought there was a dead animal in the wall or rotten pipes and a carpenter tried to find it but the carpenter found nothing then they moved out and Greg felt a little guilty when they were taking their plastic plant with them and in the book cabin fever an old man named Mr Alexander took over the Snellas’ old home and it is never revealed where the Snellas moved but I estimate they left Plainview