When my husband was first diagnosed, he was very bad off.
It was very helpful for me, as his wife, to meet with my husband and the pdoc.
It may be helpful for you to meet with your husband and his pdoc.
It would not have been helpful, at that time, to involve other family members. Other family members tend to have their own agendas. If your husband has a very supportive family, it may be a different story.
When my husband was first ill, he'd kept confusing messages the pdoc had wanted him to give to me. Finally, the pdoc and I were able to clear up communications by talking directly to one another.
An important note: Family-Focused Therapy is one of the therapeutic approaches to treating bipolar disorder.

WC