Puerto Rico is the first foal and first winner of April Showers (Galileo), a winner and second in the Gr.2 Kilboy Estate Stakes. She is a full sister to several black-type winners, led by Misty For Me (Galileo), winner of the Gr.1 Irish 1,000 Guineas among four Group 1 victories, and Ballydoyle (Galileo), winner of the Gr.1 Prix Marcel Boussac and dam of the Group 3 winner Red Riding Hood, as well as to the Listed winner Twirl.

Second dam Butterfly Cove (Storm Cat) was unraced, had two other winners and is a full sister to the Group 3 winner Kamarinskaya. Her daughter Misty For Me has produced four black-type winners: U S Navy Flag (War Front), winner of three Group 1 races including the Gr.1 Dewhurst Stakes and the Gr.1 July Cup and now a sire, his full sister Roly Poly, also a triple Group 1 winner, Cover Song, winner of the Grade 3 Autumn Miss Stakes, and the Listed winner Greenfinch.

Third dam Mr. P's Princess (Mr. Prospector) was unraced and is related to the Grade 1-winning sires Desert Wine (Damascus) and Menifee (Harlan). She produced five other winners, among them Fasliyev (Nureyev), winner of the Gr.1 Phoenix Stakes and the Gr.1 Prix Morny and later a sire, and she is the third dam of Marketsegmentation (American Pharoah), winner of the Grade 1 New York Stakes.

April Showers has a weanling colt, a full brother to Puerto Rico, and a yearling filly by No Nay Never.