Radio Buttons

I have a table and a form called patient demo. It displays last name first name and address city state zip. I created another table and form called insurance as radio buttons i have the following self, spouse, child, other. It also displays last name first name address, city, state and zip as text boxes. what i want the radio button to do is when i click self it will copy all information from patient demo to insurance form. I tried to do this several ways but every time i change the information in the insurance form it also changes the patient demo which i dont want it to do because i want to edit that box without changing patient demo. any ideas.