| "Buster's half-siblings (Bitzi's Beau)" is not an official name. |
In "Bitzi's Beau", Buster learns that his mother Bitzi has a boyfriend and incorrectly assumes that it is Mr. Ratburn. He imagines having three half-siblings, a girl and two boys. All three have Bitzi's rabbit ears and Mr. Ratburn's nose, as well as his interest in science. The girl wants to play Algebra, one boy wants Buster to read him a book in French and the other boy breaks a chemistry set and blames it on Buster. Buster screams and the fantasy ends.