Android up navigation for an Activity with multiple parents

I will stick with my comment on Paul’s answer:

The idea is to have a Stack of the last Parent Activities traversed. Example:

public static Stack<Class<?>> parents = new Stack<Class<?>>();

Now in all your parent activities (the activities that are considered parents -e.g. in your case: List and Home), you add this to their onCreate:

protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     parents.push(getClass()); 
     //or better yet parents.push(getIntent()); as @jpardogo pointed
     //of course change the other codes to make use of the Intent saved.

     //... rest of your code
}

When you want to return to the Parent activity, you can use the following (according to your code):

Intent parentActivityIntent = new Intent(this, parents.pop());
parentActivityIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(parentActivityIntent);
finish();

I hope am right (: