Control which class is instantiated first

In the scenario where I have two classes, AClass and BClass, which both have some basic code in the constructor, but AClass relies on BClass being instantiated first , how can I control the order of instantiation?

I guess I'm also looking to know how to control which scripts hit the Unity event functions (Awake(), Start() etc) first.

More details:

I have have two GameObjects in my scene (no parent/child relationship), and they each have their own class attached:

• ObjectA has AClass

• ObjectB has BClass

Bclass needs to be instatiated after AClass, because the code relies on this:

 public class AClass : MonoBehaviour
 {
     public static AClass ObjectReference;

     public AClass()
     {
         if( ObjectReference == null )
             ObjectReference = this;
         else
         {
             Destroy( ObjectReference );
             ObjectReference = this;
         }
     }
 }

 public class BClass : MonoBehaviour
 {
     bool Pass;

     public BClass()
     {
         if (AClass.ObjectReference != null )
         {
             Debug.Log( "AClass was instantiated first" );
             Pass = true; // we obviously want Pass to be true
         }
         else
         {
             Debug.Log( "BClass was instantiated first" );
             Pass = false;
         }
     }
 }