Here’s a strawman for you to critique:
Generations Class: Cultivar, with or without siblings, along with members of its family tree. If deemed appropriate by judges, class to be sub-divided by number of generations included in the entries. Blooms to be judged on ADS Historics Scale. Overall winner is judged to be the entry having best balance between breadth of generations (50%) and quality of blooms (50%). Winner receives ADS Daffodil Generations Ribbon. Entries may include blooms of cultivars (registered, unregistered, or seedlings) or species.