Welcome to HealingWell and to the bipolar board. It's good that you want to educate yourself. It must be very hard having your wife in an inpatient facility for so long. How old are your kids?
A book I own and really recommend is The Bipolar Disorder Survival Guide by David Miklowitz. It's got information about the disorder itself and details about its symptoms and treatments, as well as information about how to live with the disorder for the patient and their family.
I recommend being as honest and open with your children as is possible and appropriate, and stressing that they've done nothing wrong, that love is what mom needs. It's a tough situation. I don't envy you.
Co-Moderator, Bipolar Forum