My father is the (three) son of my grandparents的适当形式

My father is the (three) son of my grandparents的适当形式 my father is the( ) (three)son of my grandparents 用所给词的适当形式填空 1._____(their) are my grandparents. My father is He is my grandparents'son,but he isn;t my father.He is my __ john's son is the father of my son .who am i the man's father is my father's only son My grandparents are in the () photo.提示：这个词是以one的适当形式填的. 用适当的单词填空.1.My sister is father's(　　).( son,daughter ) I 【go】to see my grandparents three days ago.适当形式填空 the father of my mother is my? The mother of my father is my the mother of my father is my?