Child object won't follow the player.

I am making a top down isometric game and I used a used a tutorial for top down shooting.
It’s this one: TOP DOWN SHOOTING in Unity - YouTube
In it he makes the player face the mouse but for my game I didn’t want my player to face the mouse which resulted in it not firing at the mouse. So I applied the code to the empty game object “FirePoint” which is a child of the player but when a child has a rigidbody2D it doesn’t follow the player but the aiming works. So if anyone knows how to get it to follow the player or a better method for shooting with mouse aim without rotating the player please leave a comment.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class LookAtMouse : MonoBehaviour
    // Fix this. FirePoint won't move with the player even though it's a child object of the player

    public Rigidbody2D rb;
    public Camera cam;

    Vector2 mousePos;

    //public Transform Parent;//Remember to assign the parent transform 
    //private Vector3 pos, fw, up;

    // Start is called before the first frame update
    void Start()
        //pos = Parent.transform.InverseTransformPoint(transform.position);
        //fw = Parent.transform.InverseTransformDirection(transform.forward);
        //up = Parent.transform.InverseTransformDirection(transform.up);

    // Update is called once per frame
    void Update()
        mousePos = cam.ScreenToWorldPoint(Input.mousePosition);

        //var newpos = Parent.transform.TransformPoint(pos);
        //var newfw = Parent.transform.TransformDirection(fw);
        //var newup = Parent.transform.TransformDirection(up);

    private void FixedUpdate()
        Vector2 lookDir = mousePos - rb.position;
        float angle = Mathf.Atan2(lookDir.y, lookDir.x) * Mathf.Rad2Deg - 90f;
        rb.rotation = angle;

Wait I fixed it by putting it on kinematic