In our Chapter people always "adopted" a Big sis or Little sis unofficially, but now they are changing while their Big sis is still in school or right after she graduates with out ever telling her.
It's just hard to come back and watch another sister say hello to a girl she was told was in her family line and then have that girl, explain that she took a different Big Sister- it's just so... weird.
I agree that the focus should be on the Chapter as a whole, but this situation also seems to be hurting morale, because people are not happy with whom they originally were paired with for Big/ Little's.
I don't know why so many New Members in the last two years have chosen to take different Bigs; it might be that our Chapter has a bad system of Big/ Little Matching. If you have any thoughts on this subject as well please let me know.