Primary

• Doctor Eggman Grandson of Gerald Robotnik
• Doctor Eggman Cousin of Maria Robotnik

Extended

• Gerald Robotnik Creator of Shadow the Hedgehog
• Gerald Robotnik Grandfather of Doctor Eggman
• Gerald Robotnik Grandfather of Maria Robotnik
• Maria Robotnik Granddaughter of Gerald Robotnik
• Maria Robotnik Cousin of Doctor Eggman
• Maria Robotnik Friend of Shadow the Hedgehog