Find 1st child of root

root
child 1
child 2
child 3

from a script on child 3 how do i find child 1. Note i cant use GameObject.Find(“Child1”) because this is a prefab thus there will be more than one instance of this.

transform.parent.parent

// FINDS JOINT 2 OF THE CURRENT VINE SO YOU CAN USE IT FOR SWINGING LATER ON
//============================================================================
var tempHolder : Transform;
tempHolder = col.transform.parent;
for(var i=0; i<15; i++)
{
if( tempHolder.name == “joint2” )
{
joint2 = tempHolder;
break;
}
else
{
tempHolder = col.transform.parent;
}
}
//============================================================================