One family allowed per registration. Max family size is 12. On the next screen you will use the drop downs for each age bracket to indicate the number of attendees in your family (team). Click SAVE when you are done entering your numbers. If you select more than 12 total attendees, the SAVE button will not appear until you reduce your numbers.
Note: 'Scouts BSA' and 'Cub Scout' indicate an age range, not necessarily that the youth are members of that program.