Nelsons mother finds this out and does not want Marge giving them any charity.
Marge brings him home so he can do some chores.
They bond as Nelson tells Marge about his poor life involving his father abandoned him and never came back. Marge thinks her children no longer appreciate her, so when she finds Nelson catching tadpoles from a water fountain at the zoo, she decides to become a mother figure by spending quality time with him. Bart hates the party and to make matters worse, Lisa runs up to her room crying when Marge offers her one slice of cake. Milhouse can only attend via speakerphone because he is sick with measles. Marge throws Bart a party, which is attended by Patty and Selma, Grampa, Grandma, Ralph, and even Martin. Krabappel confesses that she did not bother to fold up the map during the test, so Bart and everyone else received 100. Despite Homer discovering that the watermark of Barts test is real and that all the answers are correct, he and Marge speak to Barts teacher. Bart brings home a geography test with a grade of 100, eagerly expecting a party that was promised to him if he had got a 100. Homer only makes matters worse when he tells her about the 'Simpson butt', something that all Simpsons have. She becomes self-conscious about her weight. Lisa gets teased by Sherri and Terri about her big butt, so this embarrasses her.
