BipolaRNurse are we siblings?

All 3 of my siblings, aunt, and grandfather were dx. severe bipolar or schizophrenia. I suspect my grand mother , mom have bipolar 1 and my dad may have bipolar ii. I am the only one currently in treatment for it. Everyone in my family disagrees with me or anyone else getting help for mental illness and feels everyone can get diagnosed with bipolar. I do feel I will loose several family members by there own hand but only time will tell.