Arabian Lion is out of Unbound (Distorted Humor), who was stakes-placed. She is a full sister to the stakes-placed Mary Rita, dam of the dual Grade 2 winner Major Dude. Arabian Lion is a half-brother to Malibu Star (Giant's Causeway), an eight-time winner, the dual winner Lost Wish (Mshawish) and the winner Tizzire (Tiznow).

Second dam Possibility (A.P. Indy) was a winner.

Third dam Personal Ensign (Private Account), a champion and multiple Grade 1 winner, is the dam of three Grade 1 winners: the champion two-year-old filly My Flag (Easy Goer), who won three races at that level, and the sires Miner's Mark and Traditionally, both by Mr Prospector. Her daughters also include the Grade 2-placed Salute (Unbridled), dam of the Grade 1 winner and sire Mr Speaker and of the Grade 3 winners Vigilantes Way and Fire Away, the winner Pennant Champion (Mr Prospector), dam of the Grade 3 winner Animal Spirits, and the unraced Title Seeker (Monarchos), dam of the Grade 3 winners Title Ready and Seeking The Title.

My Flag produced the dual Grade 1 winner Storm Flag Flying and the stakes winner With Flying Colors, and she is the grandam of the Grade 2 winner Parading and the Grade 3 winner Teresa Z and the third dam of the Grade 2 winners Dynamic One and Jouster. Through Pennant Champion the family also includes the Grade 2 winner Interactif and the Grade 3 winners Divine Oath, Auntie Joy, Ocho Ocho Ocho and Stretching, while Title Seeker is the grandam of the Grade 1 winner Seeing The Soul.

Unbound has a filly foal by Frosted.