As for his sister, she prob has low self-esteem and the only place she has some 'power' is in her house. it's her boat and your presence is rocking it a bit. so try to give her some importance so she doesn't feel her power is slipping away. that way when u do need some time alone or some any other kaam, she will be more likely to agree.
I dont understand how you are coming up with this conclusion?
the sister was acting out of love... there were shootings going on around their place.. if my sister or bro were out, id freak out just as much.
What has that got anything to do with self-esteem? And it's not even a power battle... I have a sister and a bhabi, and i would never think i was losing some power battle...