It is advisable not to give photocopies of the property documents (such as sale deed) to outsiders such as brokers. Though normally such photocopies would not be misused, but you never know.
Your brother can show the copies or the originals of the documents to the brokers, if they so insist for their satisfaction about you being the owner of the property. In the worst scenario, you can give Cancelled photocopies, i.e., putting CANCELLED words all across the photocopy in big letters, to trusted brokers. Or, you can tell them that you can show the documents to a prospective customer who shows interest in the property after seeing it.
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