Westover is out of Mirabilis (Lear Fan), winner of the Grade 3 Churchill Distaff Turf Mile S. and third in the Gr.1 Prix de la Foret, who has produced seven winners from nine runners. He is the best of her two black-type winners, the other being his full brother Monarchs Glen, winner of the Gr.3 Darley S. and the Listed Foundation S. and Listed Wolferton S. among three Listed wins, and a stakes winner who was graded stakes-placed in the US. Mirabilis is a half-sister to Nebraska Tornado (Storm Cat), winner of the Gr.1 Prix de Diane and the Gr.1 Prix du Moulin in 2003, and to Burning Sun (Danzig), winner of the Gr.2 Prix Eugene Adam.

Second dam Media Nox (Lycius) won the Grade 2 Buena Vista Handicap and the Gr.3 Prix du Bois. Nebraska Tornado is in turn the grandam of the Group 3 winners Mallory and Marbling and the Listed winner Sassy 'N' Smart.

Third dam Sky Love (Nijinsky II) won at three. She is also the dam of Bonash (Rainbow Quest), a multiple Group winner who took the Gr.2 Prix de Malleret and produced the Group 3 winners Day Flight and Sense Of Joy.

Bonash's descendants also include Phoenix Tower (Chester House), winner of the Gr.3 Earl of Sefton S., four times Group 1-placed and later a stallion, and Anfields Rocket (Coup De Grace), winner of the Gr.1 South Africa Classic.