Big, fat, wiggly post-turkey HUGS!!!!
I wanted to come back and apologize if my tone was harsh. I have a hard time not seeing everything through my own glasses here. Every child who lives with an alcoholic parent sends a hot poker through my heart. Because I see in my own how they try to love a parent who isn't capable of loving them back, even in the most basic ways -- respecting them, making sure they're safe, that they get enough food, and enough sleep.
And being the parent who is prevented by the law from protecting our children from the person we used to share a life, and a bed, with, is a special kind of hell. There are days when I feel like I betrayed them by leaving, since I can't protect them while they're with their drinking father.
I hope and pray that your lawyer can push this in the direction where you get full custody. And if/when your ex gets sober, your son will be able to build a healthy relationship with his father. And until then, he will be with a healthier, safer parent.