BRM..….45 days is still very, very early on....
One thing to be aware of is that a person who is bi-polar, and, perhaps, in a hypomanic state is commonly hyper sexual.....promiscuity is common...even if it is not in their usual character....as are a lot of other impulsive behaviors....
When a person is heavily intoxicated, it is hard to know where any of the behaviors are really coming from.....
I would say that it is important for you to not "panic", at this point. You will need some professional support...as much as you can get.
Of course, you will need legal advice...even if you are not planning to do anything, right now....especially around issues of custody....
You should have your own therapist/counselor who is experienced with treating families of the addicted....(one would assume that any decent counselor will have some basic knowledge of bi-polar)……
You are going to need to educate yourself about alcoholism as well as bi-polar...
If she is truly bi-polar...she will need ongoing supervision by a psychiatrist in addition to her other therapies....as she will need her medications and symptoms monitored.....
Your own therapist can help you with your parenting...I would say to keep life as stable and as close to "normal" as possible....they probably will need extra time and attention from you, just now.....
Perhaps, you can work it out with your wife to see the children for some short visits, with you present...
The next year is likely to be a rocky time for your wife and your family...as it will take some time to see just how the future is going to unfold.....
Just be sure to get lots of professional help....