Mendocino is out of Mill Marin (Pivotal), a stakes winner in Sweden, and is her first Group 1 winner. Her first foal Marshmallow (Soldier Hollow) won the Gr.3 Grosser Preis der Landeshauptstadt Dusseldorf, while her fourth, Millionaire (Adlerflug), a full brother to Mendocino, was stakes-placed in Germany when third in the Listed Junioren-Preis.

Second dam Mill Guineas (Salse) was placed in the Listed Prix d'Automne and has six winners, among them Mill Marin and Olvia (Giant's Causeway), runner-up in the Listed Prix Herod.

Third dam Memory's Gold (Java Gold) was a winner and had four runners, three of them winners. The best is Ronda (Bluebird), winner of the Falmouth S., then a Group 2, and dam of the sire Istan (Gone West), who won the Grade 3 Ack Ack H., and of Gibralfaro, a Grade 2 winner over hurdles in the US. The others are the stakes winner Silver Gilt (Silver Hawk), who took the Listed Esher Stakes and was second in the Gr.3 Prix de Conde, and the winner Purring (Mountain Cat). Purring produced Purr Along (Mount Nelson), winner of the Prix du Calvados and the Ridgewood Pearl S., both then Group 3 races, Katawi (Dubawi), winner of the Listed Land O'Burns Fillies' S., and the dual stakes-placed Lady Francesca (Montjeu).

Fourth dam Memory Lane (Never Bend) won the Gr.3 Princess Royal S. and is a full sister to Mill Reef, winner of the Gr.1 Derby.

Mill Marin has a yearling colt by Gleneagles named Mount Everest.