Iresine is the second of five foals out of Inanga (Oasis Dream) and one of her two winners. Inanga is a full sister to the winner In Chambers, second in both the Gr.3 Prix de Guiche and the Gr.3 Prix Daphnis. She is also a half-sister to Too Marvelous (Dansili), who won three times, and to Paper Profits (Kendor), the dam of Double Look and Scarlet Honey, both winners placed at Listed level.

Second dam Cas Royaux (Woodman) did not race. She is a half-sister to the Group 3 winner Roi De Rome (Time For A Change), to the winner Resquilleuse (Dehere) and to Rose De Thai (Lear Fan), a winner placed at Group 3 level. Rose De Thai produced the Group 3 winners D'Anjou and Truth Or Dare, the latter a sire, and the Listed winner Sandstone, who was Group 3-placed.

Third dam Reve De Reine (Lyphard) won three races and was placed at Group 3 level.

Too Marvelous is the dam of the Group 3-placed winner Earth Amber, whose daughter Luccia won at Listed level over hurdles. Resquilleuse produced the Listed winner Flash Dance, dam of Enlighted, twice a Listed winner.