Which questions is correct:
"Where am I and my sister?"
"Where are I and my sister?"
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Think about it:
My sister and I are going to the store.
My sister and I are now at the store.
My sister and I are where?
Where are my sister and I?
Don't semantically muddle the issue by relocating "I" before "sister" in order to lean on the seeming rightness of "I am." However you decide to say it, though, "my sister and I" or the more egomaniacal "I and my sister," it doesn't change the fact that it calls for the first-person plural conjugation of the verb "to be," also known as the "we" conjugation.