brothers.

 How fun would it be to have a brother that copies everything you do?  I think pretty fun. 

How fun would it be to have a war with double popsicles? Not so much.

(and no, my mother doesn't give them two popsicles, they tore apart their doubles :P)

How fun would it be to be this young again?  Pretty fun.  

How fun is it to be their sister?  Super.  

And how fun is it to be this cool?  Pretty fun, I'd imagine.