Mama Cocha is out of Buchiko (King Kamehameha), who did not earn black type but won four of her 16 starts and was placed three times. Mama Cocha is a full sibling to Sodashi, champion two-year-old and three-year-old filly and a multiple Group 1 winner in Japan. Buchiko's half-sisters include Yukichan (Kurofune), a three-time Listed winner on dirt, and the dual winner Marshmallow (Kurofune), dam of the dual Group 3 winner Hayayakko (King Kamehameha) and of Pionono, a winner placed at Listed level.

Second dam Shirayukihime (Sunday Silence) was placed and is also the third dam of Meikei Yell (Mikki Isle).

Third dam Wave Wind (Topsider) was unraced and produced three winners.

Buchiko has the white two-year-old colt Kalpa (Maurice), third on his debut, a dark bay yearling colt by Maurice, and a white filly foal by Maurice born on 9 February.