code: def children(self, primary=None):
          
          return self.connection.dependencies.children(self.full_table_name, primary)
docs: :param primary: if None, then all parents are returned. If True, then only foreign keys composed of
              primary key attributes are considered.  If False, the only foreign keys including at least one non-primary
              attribute are considered.
          :return: dict of tables with foreign keys referencing self