How to rotate camera around children objects

Unity Engine
1

I have been working anatomy type application. But i face this problem doesn’t know how to solve this issue. Whenever i try to rotate my camera around children object my script doesn’t work. Can someone help me with this. Thank you. Please view video below.

//this is the camera rotate script
using System;
using UnityEngine;
public class mongol : MonoBehaviour
{
    public GameObject Obj = null;
    public float minX = -360.0f;
    public float maxX = 360.0f;
    public float minY = -45.0f;
    public float maxY = 45.0f;
    public float sensX = 100.0f;
    public float sensY = 100.0f;
    float rotationY = 0.0f;
    float rotationX = 0.0f;
    float MouseX;
    float MouseY;
    void Update()
    {
        var x = Input.GetAxis("Mouse X");
        var y = Input.GetAxis("Mouse Y");
        if (x != MouseX || y != MouseY)
        {
            rotationX += x * sensX * Time.deltaTime;
            rotationY += y * sensY * Time.deltaTime;
            rotationY = Mathf.Clamp(rotationY, minY, maxY);
            MouseX = x;
            MouseY = y;
            Obj.transform.localEulerAngles = new Vector3(-rotationY, rotationX, 0);
        }
    }
}
2

How is Obj being set? When you select the skull, does the Obj reference change to that Gameobject?

3

nope i dont get what you saying sorry

4

You’re rotating the Obj gameobject in the script. How is the Obj gameobject set? There must be another script setting variables, otherwise it will always be null.

5

oh ok It got 304 children and 1 parent object. I have attached this rotation script to camera and i attached parent object as its target. But whenever i select children object its doesn’t zoom into center of the screen and can’t rotate selected object in the center of the screen. I share you video please help me out.
https://www.youtube.com/watch?v=hMmHvCyIvqY