No offense to anyone who has posited this, but I wonder how you can be sure of a family history of BP if they haven't been officially diagnosed?

And I wonder if pdocs do note down a family history if the person in question hasn't been officially diagnosed but the pt feels sure they have it? What do you think?

I only know for sure that my cousin has BP 1 because he was found in rags in a city claiming he was Jesus Christ, hospitalized and then diagnosed. As for the rest of my immediate family, I haven't noticed signs or symptoms, but more distant relatives I just don't know of their diagnoses, despite 'off' behaviors. So how can I, or anyone, be fully sure without an official diagnosis?

A lot of us are really aware enough to notice signs and symptoms, I know, but how can you be sure without a pdoc (a professional) having actually diagnosed BP?