Introduction
============


1. Datamodel 

The datamodel looks like this:
   
                     1..*
          Group --[Has_Account]--> Account
            ^
            |
   [Is_Group_Member_XXX]  
            |
            |         1..*
         Person  --[Has_Account ]--> Accounts 
          /  \    
[Has_Father][Has_Mother]
        /      \
       V        V
     Person   Person --[Has_Account ]--> Accounts 
     

where the XXX in the group member relation ship the name of the group represents.

