Sgctxok,
I have two teeny boppers myself. They both like to yell and they think they know everything. I like terra45s Idea. By repeating that phraze over and over again they will get sick of hearing it. I think they would find it annoying.

I like to keep humor around, so when they start arguing with me or each other I look up the staircase and pretend I am calling D and S to come downstairs (basically the two that are yelling are not my little darlings, I have sent the two yelling kids upstairs and told them to send D and S down because I dont like these two. They go upstairs and come running down, MoMMy, Mommy we love you kiss and hugs. Then we start fresh. You never know what is going to work at this age. I have always said if you cant get along with each other then you arnt going to be able to go out with your friends. I have to know that the family is looked after first.
Just my thoughts, thanks for asking.
Loretta