Gewan is the second foal and first winner of Grey Mystere (Lethal Force), a winner at two who was second in the Listed Grand Criterium de Bordeaux in France.

Second dam Creamcake (Mr. Greeley) was unplaced and has four other winners, among them Ginalyah (Chachnak), a winner who was second in the Listed Prix Caravelle.

Third dam Cracovie (Caerleon) produced seven winners, among them Coquerelle (Zamindar), winner of the Prix Saint-Alary, then a Group 1, and Spring Master (Mastercraftsman), winner of the Gr.3 Prix du Lys. She is also the third dam of Fair Angellica (Harry Angel), winner of the Gr.3 Sceptre Stakes.

This is the family of Roi Normand, Trampoli and Luth Dancer.

Grey Mystere also has a yearling colt by Ghaiyyath and a colt foal by Native Trail.