For Ages 0–17
- For twins 12 and younger, parents complete the questionnaire for both twins.
- For twins 13-17, twins complete the questionnaire themselves with parental permission.
- On the twins’ 18th birthday, we will send them an invitation to continue their participation in the Registry as adult members.
If you are a parent who is interested in enrolling your twin children in the Washington State Twin Registry, you can complete our enrollment interest form below.