Lucas Nickle and Tiffany Nickle's grandmother is commonly referred to as Mommo.


Lucas' grandmother is very hyperactive and believes that aliens will invade earth, revealing her slight insanity. She is however a caring grandmother who fights for her grandson's life when the ants take him. She is also very ditsy, which adds an unintentional humorous side to her.


Lucas' grandmother is a heavy, short woman. She usually dresses in sweats with aliens patterned on her clothes. She also has grey hair and wears dentures.