QUESTION ABOUT F4 INTERVIEW?

HI, I AM THE SPONSOR OF MY SIBBLING IN AN F4 CASE, HE WILL HAVE AN INTERVIEW SOON WIHT THE US EMBASSY IN THE DOM REP, I WANT TO BE WITH HIM IN THE INTERVIEW, I WANT TO KNOW , SHOULD I NEED AN PERMIT TO BE WITH HIM, IF SO, WHERE AND HOW SHOULD I GET THE PERMIT, THANK VERY MUCH FOR THE INFO
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