Not little sisters...but...had to love our Big Brothers who went by the nickname "Moonshiners" They were mostly the GDI boyfriends of the girls in the house, the hashers, a few baseball players, friends who didn't go to school with us..and a smattering of fraternity guys. The different Big Bro groups played broom ball against each other. We usually had a mixer with them. They would have a box dinner auction and the girls would bid for their dinners- which were usually very good..quite elaborate picnic dinners. I remember buying one box dinner where the guys wore tuxes and really did it up!
They were really nice guys. I'm not in any way advocating big brother groups but the guys themselves were truly sweethearts. And it worked out well for more than a few of them who are now happily married to my sisters!