Bart becomes jealous of Maggie and Lisa's special bond as sisters, so he goes to an orphanage and "adopts" a little brother.
One snowy day in Springfield, Lisa informs Bart that she and Maggie share a bond that Bart will never understand because he doesn't have a brother, so Bart asks Homer for a baby brother. When Homer denies Bart's request, Bart makes his way to the Springfield Orphanage to find what he thinks he's missing.—FOX Publicity