To whom do I submit "permission"

I have been asked to do work for 2 nieces who recently died. I originally indicated the proof of permission request be sent to their mother. But since she is difficult to contact for various reasons, I can now have their brother give permission, to expedite matters. I just don't know how to change that contact info. Is there a phone number I can call or some place on familysearch to change the request? It does say the permission is "under review", but I'm certain nothing would have been received by this site.
Answers
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You will receive an email after the 110 team has reviewed your request. You can then add information by reply to the email you receive. Please be aware they take cases in the order they are received, and they are very busy.
Good luck with your request.
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