First off, there are only 8 Klumps at the table - Sherman, Denise, Mr. Klump, Mrs. Klump, Grandma, Isaac, the brother, and the brother's son (can't think of their names). However, when they first arrive there are only six of them, that's why he said "Klump party of six please." Even though you are supposed to say how many people will be there total, he still said six and then Grandma and Isaac show up later because they were getting frisky in the car and she had to give him a little appetizer.