Amber
Doctor Simpson
Frank
Great Uncle Chet
Kang
Second cousin Stanley
Uncle Arthur
Great Uncle Boris
Clancy Bouvier
Gladys Bouvier
Jackie Bouvier
Ling Bouvier
Patty Bouvier
Selma Bouvier
Great Aunt Hortense
Uncle Hubert
Maggie Junior
Herb Powell
Abbie Simpson
Bart Simpson
Bill Simpson
Cyrus Simpson
Grampa (Abe) Simpson
Homer Simpson
Hugo Simpson
Lisa Simpson
Maggie Simpson
Marge Simpson
Mona Simpson
Orville Simpson
Uncle Tyrone

Check them out...

Going through the list:
Cyrus, Bill and Hortense Simpson is Abes brother only mentioned in flashbacks
Orville Simpson is Abes father, Yuma Hickman was his mother and not mentioned on the list?
Abbie Simpson is Homers half sister (from England
Anyone worth their Simpsons salt could've done better than the contestants did. I had twenty on my fingers and toes before they even started answering (although i said Mother Shabubu instead of Frank). And we freaks prefer not to be called freaks but rather obsessives. *Freaky chortle*