you might be low rankers but they are kids and you are an adult, they should show respect to you, one would think a high ranker parent should´ve tought that to theirs kids.........if you want respect show respect.........

and besides it´s YOUR yard!!........you have full rights to let them know you don´t want them playing there from now on........and letting them know is kind enough........IMO and that way they can be understanding and not trying to work out vengeance......(sp?no clue about that )