Pi's father dicided to move ( )(his/their)family to Canada

问题描述:

Pi's father dicided to move ( )(his/their)family to Canada
Pi's father dicided to move ()(his/their)famili to Canada

Pi's father decided to move (their,他们的) family to Canada.
Pi的父亲决定把他们家迁到加拿大.
家不是父亲一个人的,应该用their表示他们共同拥有.