Rotate object on another

Unity Engine
1

HI,

I have object that’s rotates around
how do I make when another object is on this object
the other object will rotate too.
I thought to make the object child of the object that rotates
but is their an easier way?

thanks in advance.

2 
Transform masterObject; //or make this public and set it in the inspector

void Start()
{
    masterObject = GameObject.Find("blabla").GetComponent<Transform>(); // set it to public and then you don't need this
}

void Update()
{
    //this may be the wrong rotation.  it could be localRotaion, or eulerAngle.....
    transform.rotation = masterObject.rotation;
}