George Sanderson, better known as Mr. Sanderson, is the father of Jenny Sanderson and the husband of Helen Sanderson. He bought a Chibi-Robo for Jenny's birthday, making Mrs. Sanderson angry since he had just lost his job and they didn't have much money. He also buys lots of toys despite being an adult and being in between jobs, with a special love for Drake Redcrest.
Because he admired George "Joy" Ebisu, he originally wanted to join Citrusoft but was unfortunately denied. As a result, he joined their rival company, Macroware Robotics, Inc. instead. He then created the Spydorz in order to help people, but Macroware Robotics, Inc., used them for evil doings, so he retired in response. Later in the game, his whole family is attacked by Spydorz and it's up to Chibi-Robo to save them. At the end of the game, he gets a job at Citrusoft.
Mr. Sanderson does not appear in the game, but is mentioned by Telly. Between the events of Plug Into Adventure and Clean Sweep, Mr. Sanderson was hired by Citrusoft and invented trash cans that generate House-Watts to combat the energy crisis caused by Chibi-Robos.
He used to be the drummer in a band called Rainbow Water. He and Mrs. Sanderson met when he was a part of this band.
Mr. Sanderson tends to have a childlike behavior and is very lazy. He has shown to have a slight fear of his wife due to the fact that she was angry with him. Despite his behavior, he deeply cares for his family and tends to be protective of them.