Whitebeam is out of Sleep Walk (Oasis Dream), who won three races, and her half-sibling Lucid Dreamer (Dansili) has won twice. Sleep Walk is a half-sister to the sire Logician (Frankel), winner of the Gr.1 St Leger, to the triple Group 3 winner Suffused (Champs Elysees), to Collide (Frankel), a Listed winner in France, and to the Listed-placed Battlement (Dansili), dam of the twice Listed-placed Crenelle.

Second dam Scuffle (Daylami), a triple winner, finished third in the Listed Snowdrop S. She is a half-sister to the dual Group 1 winner and sire Cityscape (Selkirk), to the sire Bated Breath (Dansili), a Group 2 winner and Group 1-placed, and to the unraced Tarentaise (Oasis Dream), dam of Equilateral, a Group 2 winner and second in the Gr.1 King's Stand S.

Third dam Tantina (Distant View), a dual Listed winner, took third place in the Gr.3 Supreme S.

Whitebeam represents the sixth generation of this Juddmonte family, which goes back to Best in Show, Broodmare of the Year in 1982, through the branch of her daughter Monroe. The family also includes Unquestionable (Wootton Bassett), winner of the Grade 1 Breeders' Cup Juvenile Turf.

Sleep Walk has an unraced 2-year-old colt by Frankel named Nightwalker and a yearling colt by No Nay Never.