behaviour genetics is a subdiscipline concerning about parental and grandparental behaviour-hereditary genetics and I didn't find any flaw about 'If your relatives or parents are stutterers,you are a stutterer according to what behaviour genetics say'.I'm not retorting genetic stutter just more exactly renaming it. Since you haven't read all of my posts,just do it now although I've deleted some of posts.The relevance between sleep and stutter will help you a lot trust me. Getting a stone in mouth doesn't mean that you have to really hold a stone in your mouth in dialogues and conversations everybody will perceive it ridiculous.But it reveals that stuttterers' speech rhythms are with some problems and not entirely shutting your mouths can destory [rhythms.You](https://rhythms.You) can try to lightly stick a finger in your mouth then you won't feel any blocks.