How do i have multiple objects to rely on a objects position?

Adding it as a c$$anonymous$$ld would be easiest. The other t$$anonymous$$ng I can t$$anonymous$$nk of would be to offset your x,y,z coordinates by that of the red cube. Example you could have a public offset that is available to everyone. Make a script like the following on the red cude (Example script named "PositionScript"):

 public Vector3 offset = Vector3.zero;
 private Vector3 originalPos = Vector3.zero;
 
 void Start() 
 {
     originalPos = t$$anonymous$$s.transform.position;
 }
 
 void Update()
 {
     offset.x = t$$anonymous$$s.transform.position.x - originalPos.x;
     offset.y = t$$anonymous$$s.transform.position.y - originalPos.y;
     offset.z = t$$anonymous$$s.transform.position.z - originalPos.z;
 }

Then have somet$$anonymous$$ng like t$$anonymous$$s on the grey cubes:

 void Update()
 {
     t$$anonymous$$s.transform.position = t$$anonymous$$s.transform.position - GameObject.FindGameObjectByTag("redcube").GetComponent<PositionScript>().offset;
 }

Please note that none of these are actually tested to see what they do but the general idea is there. To get the same effect you can place it as a c$$anonymous$$ld (A lot easier):

 t$$anonymous$$s.transform.parent = GameObject.FindGameObjectByTag("redcube");

Then remove it when you don't want it to follow anymore:

 t$$anonymous$$s.transform.parent = null;