During the wedding, get photos of all the important parts of the entire wedding/ceremony. Im not familiar with what goes on in an India wedding, but all the things that happen in it, make sure to get photos of. Get pics of the different guests posing with you or sitting at their tables.
As for your relationship pics, you just need one photo per event, don't need multiple photos of you guys at the same place doing the same thing. Your pics should show you guys clearly looking happy and like a couple, not some generic expressionless poses. Also it would be great if you get pics of your spouse's family at different events with you and your spouse, or your family with you and your spouse, etc. As well if you can get pics of you or your spouse's friends with you guys, then that's great too. All these pics would show a genuine relationship because you guys are trying to get each other's friends and family into your lives.
There's no specific number of pics you need, just get as much as you need.
