The correct grammatical sentence is given in the given statements is ‘The nurse spoke to my sister and me about our mother's condition”.
The correct grammatical words such as nouns and pronouns are used in the above sentences where, “my sister” and “me” are significant grammatical words to represent properly.
Thus, the options (d), (c) and (a) are incorrect.
The correct grammatical words such as nouns and pronouns are used in the above sentences where, “my sister” and “me” are significant grammatical words to represent properly.
Therefore, the correct option is – b. The nurse spoke to my sister and me about our mother's condition.