My mom claims she did well into her teenage years but learned not to do it anymore. I don't really believe her unless someone else here knows someone who grew out of their stutter beyond their childhood years. Maybe it's possible, but my mom sometimes doesn't know what she's saying. My theory is that she would just fumble over her words a lot, which is different from stuttering. Other than that, no. I'm the only one who stutters in my family.