Walt (voiced by Maurice LaMarche), Larry (voiced by David Herman) and Igner (voiced by John DiMaggio) are Mom's three sons, who are often on the receiving end of her verbal and physical abuse. Walt is the oldest and the leader with a voice based on Vincent Price, Larry, true to his name, is the middle stooge of the trio with a spineless personality, and Igner, the youngest, dumbest and most easily distracted, is the aptly named ignoramus. It is revealed in Bender's Game that Professor Farnsworth is Igner's father, and other scenes imply that Professor Wernstrom fathered the other two as well.