I'm the first to be diagnosed with bipolar, but my brother has been diagnosed with depression. My mom is probably at least cyclothymic. My grandma is insistent that no one else in our family has mental problems, and that my brother and I are being "selfish" to make people worry about us for no good reason, and that we just need to "choose to be happy".

My biological maternal grandfather, whom I've never met, cheated on my grandmother and has had some very nasty, irritable behaviors that
could have, maybe, stemmed from dysphoric hypo/mania. And I have a great-uncle or something who was arrested for running around outside naked. But every family has someone like that, lol.
I have a very small family-a mother, a father, a brother, one uncle, and grandparents. I have no cousins.