Drinking

My other half has a drinking problem. He said it was for pain management at first so I let it go for a while cause it wasn't bad. I pushed him to fix the pain issue properly and he has. His family enables him to no end. They know he has a problem but will do anything to keep him happy. He's spoiled. He's not an angry drunk or abusive. I just can't take it anymore. It's getting out of hand. I've tried talking to his family members and they are no help at all. He was angry tonight because my daughter (6) who isn't bio his got upset at bed time. So he took the Ipad away and she got even more upset. He said he would smash it. And that made me angry because it's my child. So that was the big issue... I cut my kiddo a lot of slack because we just did a huge move 15hours away from my life and family to start a life with him because his job is great here. I don't know what to do? Do I give him an ultimatum? Do I walk away? Just anything right now to calm some nerves :(