T O Royal is out of Meisho Ohi (Manhattan Cafe), who won three races, and is her second multiple Group winner, after Meisho Hario (Pyro), a dual Group 3 winner in Japan who was also placed in the Gr.1 February S. and the Gr.1 Tokyo Daishoten. The pair have a winning elder sibling, and the mare's last registered runner is the placed 3-year-old Meisho Sota (Drefong).

Second dam Alpine Rose (Kris S). The family through her has 12 winners in its first two generations, among them Meisho Kadomatsu (Daiwa Major), a winner who was multiple Group-placed in Japan, including at Group 2 level, and Meisho Feve (French Deputy), a dual winner and dam of the Listed-placed winner Meisho Belle Bon and of Meisho Uchide, a winner on the Flat and over jumps who was twice Group 3-placed over jumps. Alpine Rose is a half-sister to King Of Rome (Montjeu), who won the Royal Whip Stakes, then a Group 2, and was placed in the Gr.1 Preis von Europa, and to Super Espresso (Medaglia D'Oro), a Grade 3 winner in the US who was Grade 1-placed and is the dam of the US stakes winner Eamonn.

Third dam Amizette (Forty Niner) was placed. She is one of 17 runners out of Courtly Dee (Never Bend), a four-time winner, and a full-sister to the sire Twining, a dual Grade 2 winner.

This is the female line of Broodmare of the Year Courtly Dee, dam of the champion juvenile filly Althea (Alydar), winner of the Grade 1 Arkansas Derby, who in turn produced the Japanese champion juvenile filly Yamanin Paradise.