God's Window is out of Perfect Clarity (Nathaniel), a stakes winner in England who took the Listed Lingfield Oaks Trial. He is a half-brother to Perfect Portrait (Zoffany), a winner and stakes-placed in Ireland at Listed level.

Second dam Clarietta (Shamardal), a winner twice placed at Listed level, produced five winners, among them Law Power (Lawman), winner of the Listed Premio Circo Massimo in Italy, and the Listed-placed winner Clarentine (Dalakhani).

Third dam Claxon (Caerleon) won the Gr.2 Premio Lydia Tesio and produced six winners. They include Cassydora (Darshaan), winner of the Gr.3 Hillsborough Stakes and placed in the Gr.1 Nassau Stakes, and Classic Remark (Dr Fong), winner of the Hoppings Stakes, then a Listed race. Cassydora is the dam of the sire Ernest Hemingway, a four-time Group 3 winner and champion older stayer in Ireland, of Toulifaut, winner of the Prix d'Aumale, then a Group 3, and of South Sea Pearl, a Listed winner placed at Group 2 level.

Perfect Clarity has a yearling filly by Too Darn Hot and a colt foal by Kingman.