That was extremely interesting QT. And mashAllah how you learned from your experiences around you is even more fascinating.

May God help your sis in law and brother inshAllah alahumma ameen.

And help your sister fit in with her Indian family. I know how hard it is.. but it can be done and one can learn techniques to make them like her. Its just a matter of infiltrating the culture a bit.

God bless you for an open mind!