Vertical transmission through families is the most fundamental evidence that genetics is involved with a disorder, and it is well known that stuttering does indeed run in families. Documented accounts find credible reports of family members from five generations being affected. Around 70% of those affected by stuttering seem to report a family history of it. However, there are good reasons to believe that to be an underestimate and that more family members in past generations have had the disorder than generally is recalled by current family members.

Family Studies

Information about how stuttering runs in families can provide some clues about how it might be genetically transmitted, although the data from family studies are restricted in their value by the limitations of the recall of family ...

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