Instantiate a prefab as a child of an existing object?

Hey everyone! I'm working a 3D VR escape the room game. The player goes through the room opening drawers to find the randomly spawned objects. The objects have to be parented to the animated drawers for everything to work correctly. I wrote some code to randomly spawn the items in one of three locations from an array of spawn points, but I don't know how to spawn them as children of the drawers. Any help you can offer is greatly appreciated! Thank you! Here's my code:

 public Transform[] wrenchPoints;
 public Transform[] hammerPoints;
 public Transform[] knifePoints;

 public GameObject wrench;
 public GameObject hammer;
 public GameObject knife;


 // Use this for initialization
 void Start () {
     SpawnHammer ();
     SpawnWrench ();
     SpawnKnife ();

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

 void SpawnHammer()
 {
     Debug.Log ("Spawning Hammer");
     int hammerSpawnIndex = Random.Range (0, hammerPoints.Length);
     Instantiate (hammer, hammerPoints [hammerSpawnIndex].position, hammerPoints [hammerSpawnIndex].rotation);
     Debug.Log(hammerPoints[hammerSpawnIndex]);
 }

 void SpawnWrench()
 {
     Debug.Log ("Spawning Wrench");
     int wrenchSpawnIndex = Random.Range (0, wrenchPoints.Length);
     Instantiate (wrench, wrenchPoints [wrenchSpawnIndex].position, wrenchPoints [wrenchSpawnIndex].rotation);
     Debug.Log(wrenchPoints[wrenchSpawnIndex]);
 }

 void SpawnKnife()
 {
     Debug.Log ("Spawning Knife");
     int knifeSpawnIndex = Random.Range (0, knifePoints.Length);
     Instantiate (knife, knifePoints [knifeSpawnIndex].position, wrenchPoints [knifeSpawnIndex].rotation);
     Debug.Log(knifePoints[knifeSpawnIndex]);
 }