1) My mother and my father are parents.
Who are my parents?
2) My father is my mother's husband.
Who is my mother's husband?
3) Dan and Mary are Mrs. Green's children.
Who are Mrs. Green's children?
4) My mother is my father's wife.
Who is my father's wife?
5) My mother's mother is grandmother.
Who is my mother's mother?
6) My father's father is grandfather.
Who is my father's father?