O Boy...
...that's a tough one. My wife is also a bi-polar alcoholic and all I can say is that even when she's sober it's like living with an alcoholic. While I've been dealing with this since 1998, I don't have any specific advice for you but I will share that what I'm forced to accept is that the bi-polar manic incidents she has 3-5 times a year, some severe and life threatening, and all very expensive, are permanent whether she is drinking or not.
My daughter, now 16, is lucky to be alive. I may be lucky too. If I stay with her, I choose to stay with the incidents. That is the dilemma.
I'll share this also-- check with a doctor but it's my understanding that while he's drinking he cannot be effectively treated for bi-polar. They are mutually exclusive. It is WAY too early to tell if he can overcome his b-polar and alcoholism, and way too soon to expose your daughter to that kind of dynamic and life threatening (her life, not his) disease.
Take care and good luck,
Cyranoak