I understand your detaching and I commend you for it. I did find it confusing when you say he is "entitled" to a drink because it's been a year since he has seen his Daughter. One kind of has nothing to do with the other if you know what I mean?
He's an alcoholic. If they were buddy buddy he would be having a drink to celebrate her birthday.
Anyway, not criticizing you at all, I just think that it's important to call a spade a spade. There is a reason they are separate (perhaps from both sides but a reason none-the-less).