Have you heard of the [Monster Project](https://youtu.be/h5yPwWybgD4?si=wkFJAO9T2knINedr)? I stutter, neither of my parents did. I had a grandfather who stuttered. Neither of my children stutters. Sometimes they just talk too fast and have to slow down, but that's different. I think stuttering is part genetics and part of the support system of how you were raised. Plenty of people stuttered in childhood but improved their fluency so much it went away and now they are actors and prominent TV stars.