There are five people in my family. My grandparents, father, mother and I. My mother is a nurse. My father is a teacher. My grandparents were retired many years ago. My grandma was a dancer. My grandpa was a driver. But he is learning English now. I have a happy family.
I think the sentence above is an elliptical sentence, and the complete sentence should be: (They are) my grandparents, father, mother and I.
"my grandparents, father, mother and I " is a complement, but "I" is a nominative, how can it be used here?
I wonder when to use the nominative and the accusative.