The best practice to join\relate\connect 4 feature class together

What is the The best practice to join\relate\connect communities\UMP\BuiltUP\Admin boundaries,

Could you please consider the following scenario:

1. 
   

   I have a feature class with a name “community “ which I consider it the main layer in may work, so I relate it to more than one table and it has many information about the community.

   
   

   

   
   


2. 
   

   Then I have three other feature classes each one is stored in a deferent file geodatabase ( built-up area, UMP urban master plan, and Administrative boundary).

   
   

   

   
   

Now how could I join\relate\connect the three feature classes (built-up area, UMP, and Administrative boundary) to the (community) feature class so that when I identify the community point I can get the whole results from all feature class?