In the third film, Stan, the father of the family, is the secondary antagonist, and is shown to be a neighbor of the Heffley's and has a childhood rivalry with Frank, that they appeared to have gotten over as adults.
They appeared to have gotten over as adults. Stan is the secondary antagonist. This is in the third film. The secondary antagonist is this. Stan is shown to be a neighbor of the Heffley's, that they appeared to have gotten over as adults. This was in the third film. They appeared to have gotten over as adults. Stan has a childhood rivalry with Frank. This is in the third film. Frank is this. Stan is the father of the family.