Hi Erin!
Thank you for bringing your question to the Disney Parks Moms Panel!
The 2017 Tinker Bell Half Marathon weekend is set to open for registration on September 20, 2016, at Noon Eastern Standard Time. You will be able to find information and a link to register on the
Tinker Bell Half Marathon registration page. The following races are offered during Tinker Bell Half weekend for kids:
runDisney Kids Races Age Groups 1-3 years old - 100m dash
4-6 years old - 200m dash
7-8 years old – 400m dash
12 months and under - Diaper Dash for crawlers
And you're right, the 5K is also an option for families to run together!
I hope this helps! Please let me know if you have any other questions.