If the Family registration already exists, you can use Manage Initiative Records to join that family to a team.
  1. Go to Communities > Special Events > Friends Asking Friends > Kintera Thon
  2. Hover over the event name and click Bookkeeping
  3. Click Manage Initiative Records
  4. Use the search fields to find the Family leader
  5. Click Edit next to their record
  6. Click on the Edit Registration Information tab
  7. Click Join a Team
  8. Select the team for them to join and click OK