Addition/back dated rent agreement

stamp paper is valid for only 6 months inanywhre in the country,get a noc certificate from the lawyer ,proving that relationship and address proof otherwise open a savings account in any nationalized bank,with ufather and u as ajoint account,and get the address proof from that along with photograph, outdated stamp is not valid it period is six months, one agreement is formed before one year u cannot add or remove the name within 1or 2months , my idea is  just open savings account in nationalised bank with u father and u joint as a joint account  holder u get address prooof and identify proof for both of persons