How to rotate GameObjects keeping relative positions to another GameObject are fixed

I have a GameObject(Golfer) and Golfball GameObjects.

I can spin the Golfer on swiping the screen.

Code (CSharp):

1. if (Input.GetMouseButtonDown(0))
2.            {
3.                f_difX = 0.0f;
4.            }
5.            else if (Input.GetMouseButton(0))
6.            {
7.                f_difX = Mathf.Abs(f_lastX - Input.GetAxis ("Mouse X"));
8.  
9.                if (f_lastX < Input.GetAxis ("Mouse X"))
10.                {
11.                    i_direction = -1;
12.                    m_CurrentObj.transform.Rotate(Vector3.up, -f_difX);
13.  
14.                }
15.  
16.                if (f_lastX > Input.GetAxis ("Mouse X"))
17.                {
18.                    i_direction = 1;
19.                    m_CurrentObj.transform.Rotate(Vector3.up, f_difX);
20.  
21.                }
22.  
23.                f_lastX = -Input.GetAxis ("Mouse X");
24.            }

With this code, the Golfer spin as shown in the following two images.

https://stackoverflow.com/questions...ative-positions-to-another-gameobject-are-fix

I need to rotate the Golfballs by keeping their relative positions to the Golfer are fixed.

I think I need to use RotateAround.

How can I rotated Golfballs with respect to the Golfer?