In nuclear war ALL of it, leaving over-seas Pakistani (including Afghanistan) will be dead. I highly doubt overseas Pakistan will have any impact on India after that. Pakistan's culture is great! It will continue in places which are safe. India will rid itself of mortal enemy though -- at a MASSIVE MASSIVE cost.There will still be Muslims, Afghans, Baloch, Kashmiris, Gilgit-Baltistanis and overseas Punjabis and Sindhis left to continue Pakistan's cultural legacy. There will be no trace of India left on earth - every temple, historical site, and document - will burn to ashes. The diaspora Indians might mourn the death of their country for a generation or two - the whole world would mourn a tragic nuclear war after all - but all of the young Indians will eventually forget their culture and assimilate with the West.
When India will be invaded with nukes by Pakistan, it won't matter AT ALL whose pants or underpants are soiled or dried. Most of decisions will be automated or scripted. There will not be time for thinking left...... and you have not mentioned about the soiled pajama of Rajiv, after listening to Zia ul Haq.