Sonja

Sonja is a character who was Uncle Gary's fourth wife. She appears in the fifth book, Diary of a Wimpy Kid: The Ugly Truth. She and Gary were not supposed to get married as Gary was going break up with her to date her sister but when they were on a date at a baseball game, a plane flew overhead carrying a banner reading "Marry me Sonja?". She says 'yes', thinking it was for her, but it was for another Sonja. She and Gary most likely divorced after learning the truth at their wedding party.