Arthur Bouvier
Wikisimpsons - The Simpsons Wiki
Arthur Bouvier is a deceased member of the Bouvier Family, the family of Marge Simpson. His exact relationship within the Bouvier and Simpson families is unknown, although it is implied he is Marge's brother or uncle. He has only been mentioned on one occasion, by Marge, who was ashamed and said she would never speak of him again. He used to have a saying, "Shoot 'em all and let God sort 'em out," until one day he put his theory into practice, and it "took 75 federal marshalls to bring him down".