Re: How did your Baat Pakki go? & What am I supposed to do?
No problem 
I’m sure you will get on great with your future bhabhi(s).
My husband doesn’t have a sister of his own, but when his brother got married - I found my BFF in his wife (my SIL), so it can definately happen.
Just be yourself and don’t be nervous! I’m sure she’ll love you and with time you guys will get on great. I remember I had the nerves too when I was meeting everyone for the first time but honestly you’re lucky in a way that you get to have some more one on one time with his mom as opposed to meeting in a larger family gathering so take advantage of that and really get to know her.
Congrats once again and your clothing seems great, that’s probably what I would do as well. Good luck and keep us posted on how it goes!