Maggie is the baby in the Simpsons family. She shows signs of being a baby genius she spelled out E=mc2 with her baby blocks and wrote her name with an etch a sketch. In one episode she even shot MR. Burns. Lisa got jealous when Maggie got into a baby daycare and had a higher IQ than her then Lisa tried to mess her up but it turned out Lisa was helping her without knowing it. Mostly Maggie and Lisa get along and Bart can get jealous which made Bart adopt an orphan and Lisa had to get them out of the mess.