However, recently govt framed law to allot PAN to even Non Resident and Person of Indian origin. The detailed guideline is given vide PAN circular no 6 dated 11/10/2006 . Read it here to understand the documents required for getting the PAN.
As far as types of investment are concerned, he can invest in shares , mutual funds , in real estate and although PAN is not required as per I T Rule , it is better to get one, because this will help you in minimising hassles.Your brother can apply for PAN online from UTISL or NSDL sites.
