Did you have that conversation with your sis or did you let it go because she was grumpy? As an oldest sister I completely understand. On our vacation we had some problems because my little sisters' boyfriends (both 22) tried to treat my husband as their peer... I had to yell at them one night when they turned the light on (we were sleeping on the sofa in the family room) and because Laur's boyfriend made a really inappropriate "frat boy" statement about mine and my husband's personal life.