Ⅰ、1、sister
2、brother
3、mother
4、father
5、grandmother
6、grandfather
Ⅱ、1、are
2、These
3、those
4、are
5、grandparents
Ⅲ、1-5:B C B B D
Ⅳ、1、These are,brothers
2、parents are
3、Are those your
4、Who is
5、That's an,book