Both my parents had a slightly stutter that went away, one of my siblings had it but ut went away, and I had it but it never went away. All triggered after bullying... Might be a coincidence, but it might be in our genes as well and just gets triggered or not. But I also know people with a permanent stutter who have non stuttering parents as well. Increased chances? Possibly. But it is not the worst thing in the world, it is not something that can kill you