Re: rishta over chai
Tell your friend to be just himself. Thats all. If the family is a bit (just a little bit) open, they will allow the boy and girl like two minutes to talk to each other in private, thats when he should exchange the email address (it is a bit too soon to be exchanging email addresse). I would wait till the second round of talks open up between the two parties, that would be more appropriate to exchange email addresses.
For now have him talk about music, interests, and general gupshup to dertermine what makes her laugh (sweet spots). DONOT discuss politics or religion (very bad subjects on the first chai marri).
Good luck