| Seaborne's Eirennach (Seaborne's Schooner x *Kilfenora Rosie O'Day) |
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| Seaborne's Schooner, Eiren's sire, by Balius Brannigan and out of Hideaway's Greystone Covergirl |
| *Kilfenora Rosie O'Day, Eiren's dam, an imported mare by Windy Day and out of Kilfenora Rose. |
| Windy Day, Eiren's maternal grandsire. |