what is your sister and you doing?

what is your sister and you doing?

题目
what is your sister and you doing?
What is your sister and you doing?
My sister and I am watching TV
Did you have sisters or brothers?
Yes,I have
句子是否正确,如有错误请帮我改一下
答案
What are your sister and you doing?
My sister and I are watching TV
Did you have sisters or brothers?
Yes,I did.
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