Board Thread:Tapped Out Help/@comment-24.14.191.60-20140830021021/@comment-80.98.21.162-20140830043828

Bart is unlocked after you build Bart's treehouse (after a quest), Marge can be unlocked after build Moe's tavern.

http://simpsonstappedout.wikia.com/wiki/Bart's_Treehouse

http://simpsonstappedout.wikia.com/wiki/Moe's_Tavern