I think the answer can be yes, because some have the classic bipolar that responds to simple lithium. But some people have a depression that responds to simple over the counter lithium oratate or fish oil. Lucky them (?)

We think of one "worse" than the other but some have depression so bad they become catatonic, or commit suicide or live a shell of their former selves for 30 years.

So yes.

I do have a comment about multiple family members having these illnesses. The genetics can be complicated, and not be a single gene but a mixture of genes. I read that in some cases the problem can even be the mitochondrial genes (probably not if it is both you AND on your father's side) or the nuclear genes affecting the mitochondria. This explains the differences between the two, and some genetic stuff to ponder. Of course there are environmental influences acting on those genes, too (called epigenetics). Hmmm. Epigenetic changes can be passed on as well.