I'm sorry that you are having a rough time lately. I hope that your dad improves. Just saying "hi, I'm thinking of you" helps. My father was in the hospital recently and I couldn't get there to visit right away. I talked to him on the phone.
As for relapsing, it does get depressing sometimes to read posts from people who have a bunch of time and then relapse. I think it goes to what Scott says, we get lax. Some of us. Or the things that were working for us in the beginning aren't working so well anymore and we don't recognize that and make alterations. Or we know they aren't working as well anymore and don't make alterations to get us back on track. I have been getting lax myself lately and it's getting me into scary territory. I'm working on changing that. I have 18 months. I was freaking out yesterday, asking myself "how am I ever going to get to 2 years? How?" Then the simple answer came and I felt a lot better. I'll get there one day at a time. I won't drink today.