Well, it wouldn't be genetics from your neighbors (I had to do it, sorry).
You can absolutely blame your parents for your mental health problems. Not all of every problem in our brains is inherited--some of it is taught to us by our parents.
Seriously, there's a huge genetic component to mental health. Most of it is poorly understood at best, though. Sadly, there's nothing you can do about it even if it was understood.
Something that seems simple, like "depression", could have hundreds of identified genetic markers.
Since I'd always rather be doing something other than what I should be doing, if you want to get to a really really specific question, I can go look it up.