Its a difficult situation because kids were involved. As hurt and embarrassed as the parents were - their claim of discrimination is probably going to be difficult to prove but I'm not a lawyer (just a simple Caveman). Legal action wont be cheap if they decide to go forward with it. If the establishment asks someone to leave then that's their discretion. I always think of the Seinfeld Soup Nazi episode. Working in any customer service industry is difficult and I don't envy anyone doing so today.