I have a One to One relationship.

User
-----
ID
ContactID

Contact
--------
ID
FirstName
LAstName
Address

I have a contact table for different reasons(clients,Employees,suppliers etc) so the contact table will have a one-one relationship with many tables.

How should the user Business Object be?
in User Business Object have an Entity of type contact ? there is no parent or child relationship so how would on add new row for user also add new roe for contact ?

TIA