Question: Who is the grandchild of Kujō Yoshitsune?
Answer: Kujō Yoritsune

Kujō Michiie (九条 道家) (1193 — April 1, 1252) was a Japanese regent in the 13th century. He was the father of Kujō Yoritsune and grandson of Kujō Kanezane (also known as Fujiwara no Kanezane). He was the father of Norizane and Yoritsune