def print_parent_and_children_info(self, node):
        """Used for debugging - prints a short description of a a node, its
        children, its parents, and its parents' children."""
        G = self.G
        parents = G.predecessors(node)
        children = G.successors(node)

        print(general_node_label(G, node))
        tabs = '\t'
        for parent in parents:
            relation = G.edges[parent, node]['relation']
            print(tabs + 'Parent (%s): %s' % (relation,
                  general_node_label(G, parent)))
            for cop in G.successors(parent):
                if cop != node:
                    relation = G.edges[parent, cop]['relation']
                    print(tabs + 'Child of parent (%s): %s' % (relation,
                          general_node_label(G, cop)))
        for child in children:
            relation = G.edges[node, child]['relation']
            print(tabs + 'Child (%s): (%s)' % (relation,
                                               general_node_label(G, child)))
Used for debugging - prints a short description of a a node, its
        children, its parents, and its parents' children.