get child value

How do I get the Rotation X value from the main camera from another child object of the fps.

Basically I have the FPS (parent) script and 1 child object needs a value from another child object.

Here is how I got it working:

A sphere with 2 empty game objects as children (ChildA and ChildB). Each has a script attached, ChildAScript and ChildBscript

here is ChildAScript:

var some:float;
function Start () {
 some =5;
}

ChildBScript:

var go:GameObject;
var sc:ChildAScript;
function Start () { 

 sc=go.GetComponent(ChildAScript);
}

function Update(){
	if(Input.GetKeyDown(KeyCode.Space))
		sc.some+=10;
	Debug.Log(sc.some);
}

Drag the source object in the go slot in the inspector. Now I can print the value of the variable of A from B and I can also increase its value from B.