M.D.
R.,
This is just my opinion... I think you handled it pretty good, I think I would have called all the boys over first of all and asked them... of course you know you weren't going to get the truth the first time... Kids know a lot more than we want to give the credit for and if we want to be naive and think "my kid wouldn't do that, then we enable a LARGER problem down the road." I would have embarrassed them a bit so that they wouldn't try to do anything like that again in your yard, and hopefully no where else. I might even give a little talk about respecting girls in general to all of them. I would call the parents and let them know. I sure would want to know if I was a parent of one of the boys. Now the girls parents might be a little upset, but I would still call and let them know. We are the adult, and I think we send a bad message to the kids when we "cover-up" things because we don't want to make any waves or have people mad at us. We have to do the right thing. How would you really feel if you found out the boys did it to another girl and you get a call from that girls parent knowing they tried to do it in your back yard... Would you say, yeah, I saw them corner a girl in my yard a few weeks ago.
As far as talking with the other parents, be honest, tell them what you saw that you talked with your son and so did his father. Let the parents know that you like it when the boys are over and playing and that you do watch them. That you don't have a problem with them, you know they are boys and may be a little curious... Let the parents know that nothing happened... You aren't blaming any of the boys, you understand they are boys...the other parents may have a sit down with their boys and talk about respecting girls too.
I hope I didn't offend you in any way, this is my opinion, and if my son did this, I would want to know, I surely would hate to find out later on or find out worse that he did this before and no one told me. I would appreciate my neighbors for letting me know.