Coco Sun is one of three winners out of Miss Hufflepuff (Encosta de Lago), a city winner who won three races in all. Her other produce includes Nymphadora (Yes Yes Yes), Listed-placed at two this season, and the city winner Queen Of Wizardry (Not A Single Doubt). Miss Hufflepuff is a full sister to the Listed-placed Pink Siris, dam of Etana (Shamus Award), winner of the Gr.2 The Roses, and grandam of Glamour Tycoon (Written Tycoon), a Listed winner in New Zealand this season.

Second dam Miss Helga (Alzao), an imported Listed winner who took the Silken Glider Stakes at Leopardstown, then a Listed race, had five winners from five runners, among them Liberator (Encosta de Lago), a Listed winner and champion stayer in Hong Kong.

Third dam Sister Golden Hair (Glint Of Gold).

Miss Hufflepuff has a yearling filly by So You Think and has been covered by The Autumn Sun.