As far as I know patents are not inheritable. Kindly let me know if i am wrong.
My feeling is that let your brother get the US patents. Since the WTO, patent taken anywhere is valid in India.
The indians are notoriosly slow and not to be trusted in the bargain. My dad had applied for a patent in India in 1994. He did not get it since somebody who had applied in 1996 had got it sanctioned in 1997 in the US.
So dont go for Indian patent office at all.
All the best for your brother.