Rotate around Parent Object

Unity Engine
1

Hi…
Here is the code I used to rotate Chair Object around Up Axis with dragging mouse, the only problem is the chair rotate around Space World Point, my target is rotate Chair around Its Parent Object its name Chair, How can I fix that ?

using UnityEngine;
using System.Collections;

public class DragRotateSlowDown : MonoBehaviour {
   
    private float rotationSpeed = 10.0F;
    private float lerpSpeed = 1.0F;
   
    private Vector3 theSpeed;
    private Vector3 avgSpeed;
    private bool isDragging = false;
    private Vector3 targetSpeedX;
   
    void OnMouseDown() {
       
        isDragging = true;
    }
   
    void Update() {
       
        if (Input.GetMouseButton(0) && isDragging) {
            theSpeed = new Vector3(-Input.GetAxis("Mouse X"), 0.0F);

            avgSpeed = Vector3.Lerp(avgSpeed, theSpeed, Time.deltaTime * 5);
        } else {
            if (isDragging) {
                theSpeed = avgSpeed;
                isDragging = false;
            }
            float i = Time.deltaTime * lerpSpeed;
            theSpeed = Vector3.Lerp(theSpeed, Vector3.zero, i);
        }
       
        transform.Rotate(Camera.main.transform.up * theSpeed.x * rotationSpeed, Space.World);
    }
}
2

Change Line 34 from this:

transform.Rotate(Camera.main.transform.up * theSpeed.x * rotationSpeed, Space.World);

to this:

transform.RotateAround(transform.parent.position, Camera.main.transform.up * theSpeed.x * rotationSpeed);

Reference: