Well, yes at times. Sometimes they fight but they do love each other. Just like normal siblings. Lisa did help Bart stop some of Sideshow Bob's evil schemes, helped Bart get his "soul" back in "Bart Sells His Soul"(Season 7), and they had other cute brother/sister moments in the show.
WHAT. There was an episode were Bart sold his soul?! I gotta watch that!! You know the episode where this Jazz guy died and Lisa wanted a cd so their local radio station can play it? And Bart bought it for her - I really liked that episode/brother/sister moment
Heehee, yes Bart sells his "soul" to Milhouse for five bucks.
And yay, that was a great moment in that episode. It was quite sad that Bleeing Gums Murthy died in that episode. I also like that scene when Maggie gives Lisa her pacifier to cheer her up.
Season 7 is pretty good season. It's one of my favorite seasons because Lisa had some great roles and moments in that season. My favorites in that season are "Summer of 4ft2"(one of my all time favorite Lisa episodes), "Who Shot Mr Burns Part 2", "Lisa the Vegetarian", "Lisa the Iconoclast", "Bart Sells His Soul", "Home Sweet Homediddly-Dum-Doodily", "Marge Be Not Proud", "King Size Homer", "Sideshow Bob's Last Gleaming", "Bart on the Road", "Mother Simpson", the Halloween story when Homer turns 3D, "Bart the Fink", "Much Apu About Nothing", "22 Short Films About Springfield", and some others.