Car papers got transfered falsely

My father bought a car in Company's name where we three were the partner in 2005 (Father 40%, my brother 10% and myself 50%), in 2007 my brother retired from the partnership deed and in 2008 my father retired from the partnership deed and hence I became the Sole Proprietor the the said company in 2008. In 2009 my father expired. My brother and his wife was never in good terms with me, my father and my mother, staying jointly also. Now recently I have come to know that my brother has transferred the same cars papers in his name through the RTI filled from MLO vikas puri in August 2015. On seeing the set of papers from RTI filled to MLO came to know that my brother has falsely taken the NOC papers from the bank by using my companies authorised signatory stamp and my companies letter head and got all the papers of the said companies car in his name. The question is not of the amount of the car, the question is that can he use the authorised signatories stamp and letter head of the company in 2015, when he has retired in 2007. If he has done it falsely then has the bank helped him in all this transferring. How can i proceed with this against my brother and bank who have helped him.