code: def check_grandparents(self, mother = None, father = None):
          
          if mother:
              if mother.mother != '0':
                  self.grandparents[mother.mother] =  ''
              elif mother.father != '0':
                  self.grandparents[mother.father] = ''
          if father:
              if father.mother != '0':
                  self.grandparents[father.mother] =  ''
              elif father.father != '0':
                  self.grandparents[father.father] = ''
          return
docs: Check if there are any grand parents.
          
          Set the grandparents id:s
          
          Arguments:
              mother (Individual): An Individual object that represents the mother
              father (Individual): An Individual object that represents the father