There is a depression gene. That could lead someone to suicide.
It does seem that way. I have known families that had multiple suicides.
There is no such thing as a "suicide" gene but most scientists believe that manic depressive disorders or bipolarity disorders are genetic. Most people who commit suicide have a depression disorder of some kind of at least are depressed/sad/angry/apathetic when they are about to continue in their ... passing.
I tried and and failed and none of my family tried before, so I guess its the person and how weak we are and has nothing to do with gene