Presented for your approval: the known family tree of our favourite family, The Simpsons. Due to the limitations of ASCII I have had to depart from certain family tree conventions. "m." denotes "Married". "n." denotes "Nearly married"; there's a handful of these which I basically included to make the tree more interesting. "=" merely denotes "had a child with". I have also had to squish relatives from the same generation onto different levels in the interests of not stretching your browser window too much.

                                                                  ???    m. Mimsy
                                                                Bancroft |   ???
                                                                         |_____
                                                                               |
??? = Abraham J. m. Mona J.     ???   m. Jacqueline n. Charles Montgomery =   Lily
    |  Simpson   |   ???      Bouvier |     ???              Burns        | Bancroft
    |     =      |                    |_____________           n.         |
    |   Edwina   |                                  |       Gertrude      |
    |    ???     |                                  |         ???         |
    |     |      |  Sheldon m. Agnes                |                     |
    |     |      |  Skinner |   ???                 |            ??? m. Larry
    |     |      |      ____|    :                  |                |  Burns
    |     |      |     |         :                  |              __|__
    |     |      |     |         :                  |             |     |
    |    Abby    |  Seymour      :             _____|_____       ???   ???
    |   Simpson  |  Skinner      :            |     |     |
    |            |               :            |     |     |
    |            |               :            |     |     |
    |            |     Armin "Seymour   n.  Patty   |   Selma  m. Robert Underdunk
    |            |   Skinner" Tamzarian    Bouvier  |  Bouvier     "Sideshow Bob"
   Herb          |                                  |               Terwilliger
  Powell         |                                  |          m. Lionel Hutz
                 |                __________________|          m. Troy McClure
                 |               |
    Amber m. Homer Jay m. Marjorie "Marge"
     ???      Simpson  |      Bouvier
          _____________|___________________________
         |        |        |                       |
         |        |       Hugo         Bartholomew Jo-Jo "Bart" m. ???      
         |        |      Simpson                Simpson         m. ???
         |        |
         |    Lisa Marie n. Hugh St. John Alastair
         |     Simpson            Parkfield
         |
  Margaret "Maggie" = ???
      Simpson       |
                    |
          Margaret "Maggie Junior"
                   ???
    Other relatives who couldn't be placed accurately
  • In the Tracey Ullman Show short (MG09) The Funeral, Bart, Lisa and Maggie had an uncle Hubert who passed away. This seems odd in retrospect as all flashbacks from later episodes portray Homer as an only child and Patty and Selma as Marge's only two siblings. Possibly Hubert had grown up and moved away from the Bouvier home by this point - it would explain why he died so young. Or perhaps he wasn't really their uncle at all, just a close family friend. (Or a great-uncle, suggests kthejoker.)
  • Homer has a cousin Frank (whether on his mother's or father's side is unknown), who apparently slept in the same bed as his parents until the age of 21. "He became Francine back in '76. Then he joined that cult. I think his name is Mother Shabubu now." ((9F08) Lisa's First Word)
  • Homer also has a deceased great-uncle Boris. ((1F14) Homer Loves Flanders)
  • In (9F11) Selma's Choice, Marge, Selma and Patty's aunt Gladys passes away and the Simpsons attend her funeral. Her name is Gladys Bouvier, but in her video will she also addresses her sister, Jacky - Jacqueline Bouvier, Marge's mother, who only took the name Bouvier after getting married! There are four or five obvious explanations, but all of them are too tedious to list here.

1http://www.amazon.com/exec/obidos/tg/detail/-/0060965827/ref=ase_thesimpsonsarc0f/104-9848000-1331158?v=glance&s=books
A scan of the tree: http://www.geocities.com/thesimpsonsites/family.htm

Sources:
All the piped episodes of The Simpsons
The Simpsons Archive at http://www.snpp.com

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