Rowley's karate friends

Rowley's Karate Friends are friends of Rowley and are not older then six and go to karate classes with him. In Diary of a Wimpy Kid: The Last Straw they have a sleepover at one of the houses of one of them who lives in Pleasant Street same as Holly Hills and Greg goes so that he can crash into Holly's slumber party which she planned. In the party Greg is bothered by them and goes down and sleeps in the basement till the morning.