Caste certificate of family

Section 463 of the Indian Penal Code addresses forgery, defining it as making any false document with the intent to cause damage or injury.  As per the law, possessing, using, or presenting a forged document, knowing or having reason to believe that it's forged, constitutes an offense. The intention to deceive or gain an undue advantage is not necessary to establish guilt. The use of such documents, even if obtained innocently or from a reliable source, can lead to legal consequences.

Therefore, even if B obtained the document from his brother (A), if B knew or had reason to believe that the document was forged, he could be prosecuted under IPC for using a forged document, despite the fact that it originated from a competent authority.

Mam Sanskriti Tiwari , If They Haven't taken any gain so  How Can Cancel Their Caste Certificate?

The caste certificate cannot be cancelled by the authority who has issued it. Caste Verification Committee and Caste Scrutiny Committee have been constituted by the different State Government for verification and cancellation of Caste Certificate.

If any complaint is made against the Caste Certificate of any person of any particular category with the allegation that he has obtained forged caste certificate, the same shall be verified by the Caste Scrutiny Committee in accordance with the procedure prescribed by the Rules/Government Orders. 

sanskriti tiwari mam, Right now What can they do so they can protect themself from future problem . Any legal Advice Like Surrender the Said Certificate . 

Like Any Legal Remedy ?

The caste certificate has been obtained fradulently, hence the person holding this certificate has . to undergo the legal consequences as per law