    # File lib/graphviz/family_tree/person.rb, line 96
          def is_widower_of( x ) #veuf
            node = @graph.add_node( "#{@node.id}And#{x.node.id}" )
            node["shape"] = "point"
            node["color"] = "green"
            @graph.add_edge( @node, node, "dir" => "none", "color" => "green" )
            @graph.add_edge( node, x.node, "dir" => "none", "color" => "green" )
            @tree.add_couple( self, x, node )
          end