Orthodox is out of Heartwarming (Showcasing), a multiple stakes-placed mare who won once at two and finished second in the Listed St Hugh's Stakes as a juvenile. Both of her runners have won. Her full sister Unbreak My Heart was third in the Gr.3 Cornwallis Stakes.

Second dam Place In My Heart (Compton Place) won the Listed Lansdown Fillies' Stakes at Bath and was placed in the Gr.3 Prix de Saint-Georges. She bred five winners, among them Heartache (Kyllachy), winner of the Gr.2 Queen Mary and the Gr.2 Flying Childers Stakes, who in turn is the dam of the Gr.3 Killavullan Stakes winner Exactly, three times placed at Group 1 level, and the dual Group-placed Signora, both by Frankel, as well as the Listed winner Salt Lake City in Ireland.

Third dam Lonely Heart (Midyan) won twice and was Listed-placed. Six of her eight runners won, among them Leitrim House (Cadeaux Genereux), winner of the Tetrarch Stakes, then a Group 3, and later a sire, who also raced as Areq Sanood in Saudi Arabia.

The family is also linked to Stepper Point (Kyllachy), winner of the Gr.2 Sapphire Stakes and the Flying Five, then a Group 3, and to the Listed winner Lady In France (Showcasing), placed in the Gr.2 Temple Stakes.

Heartwarming has a colt foal by Too Darn Hot.