Regarding indemnity bond from sister in case of gift deed.

My father has executed a gift deed in my name and my mothers name jointly, I have a sister who is married. I have applied for the transfer of title and ownership in my housing society. Now, my society is asking for a indemnity bond from my sister as no objection. I want to know if that is required from my sister as the gift deed is executed by my father out of his own free will, love and affection. Moreover, My sister was duely informed about this and she does not have any objection.