A: My father won`t be there, and my mother won`t either.
B: My father won`t be there, and neither will my mother.

Examples:

incorrect              : She hasn`t finished the test yet, and neither I have.
correct                  : She hasn`t finished the test yet, and neither have I.
or
She hasn`t finished the test yet, and I haven`t either.

incorrect              : She is not in agreement, and neither do I.
correct                  : She is not in agreement, and neither am I.
or
She is not in agreement, and I`m not either.

incorrect              : I didn`t know the answer, and he didn`t neither.
correct                  : I didn`t know the answer, and neither did he.
or
I didn`t know the answer, and he didn`t either.

incorrect              : I haven`t seen the film, and she hasn`t neither.
correct                  : I haven`t seen the film, and neither has she.
or
I haven`t seen the film, and she hasn`t either.

Related posts:

1. Errors in Affirmative Agreement of Verbs
2. Error in Tag Endings
3. Errors in Negative Imperative

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