I was downvoted in another post by saying this but: I personally think that stuttering is a subconscious habit and not something in our dna. Litteraly no one in my family stutters except me, and i dont stutter when i talk with my parents or siblings. Even when talking in the mirror or playing sports. I think that the anticipation of the stammer is the reason why we do it in the first place. I dont have the solution but i am trying my best. Sorry for my english.