AS3 child/parent variables

So I am new to AS3 and I am stuck with something.
I have a menu and for each button I want to define a varible (clip) to declare the name of that button. All buttons have this clip variable defined inside them to make it a unique clip variable for each button.

Then I have on the main timeline a RollOver function to tell all buttons what to do on mouse RollOver. All I want is to tell in that RollOver funtion is:
clip.gotoAndStop(2);
And do the same on RollOut:
clip.gotoAndStop(1);

And it would assume the clip variable of each of the buttons so it knows which one was rollOver and RollOut and change accordingly.

But I can’t seems to access the child variable.

How can I do that? Can anyone help me?