Sanji was born in the North Blue into the Vinsmoke Family, the reigning royal family of the Germa Kingdom, along with his three brothers on the same day,with Sanji being the third son of the family,thereby making him the kingdom's third prince. Sanji's father, Vinsmoke Judge, planned to genetically enhance all of them before birth to make them have superhuman abilities and no emotions, and thus turn them into perfect soldiers in the future.his mother was against it, and took a drug to stop it.