When I was at the height of my addiction I was taking 6-10 vicodan a day and as nurse I knew the ramifications, but the need for them was stronger than running from the danger of them. Yes, tolerance Does occur. And the more you take the more you need to get the buzz. I have been clean for 6 years. I no longer ever take anything with tylenol in it. I don't want to risk damaging my liver.
Find some literature for your family to read. Educate them. If you are in therapy, have your counsleor find you some material for them to read. I did that with my family as I entered recovery and it helped them understand the disease of addiction.
Good luck!