how to make camera follow instantiated object?

I have a character the mage in this case which the camera follows and when the mage gets close to the golem it mounts it, this instantiates a new game object with the mage on top of the golem now I cant get the camera to follow this new instantiated object.

public class FollowCamera : MonoBehaviour {

 public GameObject golem;
 public GameObject MountedGolem;
 public GameObject target;

 public Camera mainCamera;

 public float interpVelocity;
 public float minDistance;
 public float followDistance;

 public Vector3 offset;
 Vector3 TargetPos;

 // Use this for initialization
 void Start () {

     TargetPos = transform.position;


 }
     

 // Update is called once per frame
 void Update () {



     if (target)
     {
         
         Vector3 posNoZ = transform.position;
         posNoZ.z = target.transform.position.z;

         Vector3 targetDirection = (target.transform.position - posNoZ);

         interpVelocity = targetDirection.magnitude * 10f;

         TargetPos = transform.position + (targetDirection.normalized * interpVelocity * Time.deltaTime); 

         transform.position = Vector3.Lerp( transform.position, TargetPos + offset, 0.50f);


     }
         
     else 
     {

         target = MountedGolem;

         Vector3 posNoZ = transform.position;
         posNoZ.z = target.transform.position.z;

         Vector3 targetDirection = (target.transform.position - posNoZ);

         interpVelocity = targetDirection.magnitude * 10f;

         TargetPos = transform.position + (targetDirection.normalized * interpVelocity * Time.deltaTime); 

         transform.position = Vector3.Lerp( transform.position, TargetPos + offset, 0.50f);

 

     }



 }

         

}