docs: def to_json(self):
          """
          Return the individual info in a dictionary for json.
          """
          self.logger.debug("Returning json info")
          individual_info = {
              'family_id': self.family,
              'id':self.individual_id, 
              'sex':str(self.sex), 
              'phenotype': str(self.phenotype), 
              'mother': self.mother, 
              'father': self.father,
              'extra_info': self.extra_info
          }
          return individual_info