The past is the past and all you can do is go forward. Alcohol makes nothing better for anyone, ever. Each day you don't drink is a day you are living- and being present for your family who obviously love you very much and need you.
Keep doing what you're doing, but focus on the FREEDOM you have when you don't drink. Don't focus on what you perceive to be missing, for you are missing nothing.
Speedy recovery to your dad!