Legal Question in Civil Litigation in India

rest 7 need to file a suit for partition and cancellation of sale deed executed by 16 legal heirs.

Dear Sir,

Rest seven legal heirs have to file a suit for cancellation of sale deed executed by the sixteen of their respective legal heirs and suit for partition establishing their specific shares. And said 7 (seven)legal heirs can also give the written notice to the municipal authority for not to change of the khata subsequently into purchaser, if any. And bring the mere said suit within three years time period limitation from the date of knowledge that within total twelve years over all time period limitation, Or otherwise for the purchaser default also have the caveat emptor or apply on him & he has to vacate the legal possession if any one in such legal possessions, that within 12 years time prescription & file a suit afterwards legally defending him.