Look at the photo, answer is in his eyes! Sutton has nothing to worry about.
Sutton, obviously. Ben hates to admit it and this is still an obstacle they are overcoming but the fact you are reading this question and laughing proves the answer is correct. (P.S. from Ben - Sutton wrote this answer, obviously, but may not see this edit, so who is really laughing now?) (P.P.S. from Sutton-Sutton did read this edit and thinks this is a lame attempt. It's ok to be the second funniest in our relationship.)
Kelyn. She has been wanting a brother FOREVER. Ben is equally excited to have someone to annoy him and to annoy in return. They enjoy camping fun, skiing together, playing games (although Kelyn hates how Ben has to follow the rules), and jointly picking on Sutton.
No. This is not a property exchange and we are established individuals. Besides, Ben enjoys always spelling his name when saying it aloud and Sutton likes the thrill of confusing people on which name is her first or last. Why take that away from us?