Again, welcome!
While it can be uncomfortable to talk about an illness, it can be very rewarding for all parties involved. Opening up communication could be very helpful, if it's possible.
Do you know what type of bipolar your family member has been diagnosed with?
You might be interested in seeing if there is a NAMI chapter near you. NAMI offers support/education to families, as well as to the individuals living with mental illness.
I am thrilled you'd like to know more! So many people live in denial, which does not help anyone.

WC