In the first sentence it is votre frere andthe answer is vôtre frere???
I am not sure what first sentence you are referring to but -
'votre' is 'your' and doesn't have a circumflex accent on it and it will be followed by a noun -
C'est votre frère? = Is he your brother?
But Le/la vôtre is yours and does have the accent.
Ce livre, c'est le vôtre? = Is this book yours?
Hope this helps!
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